The best Ruger RXM upgrades use the one trick a Glock can't match: you swap the grip, bolt a red dot straight to the slide, and buy parts that name the RXM.
Our top picks
- Best first upgrade: Magpul EHG RG9 grip module, about $35 to $40
- Best red dot: Holosun HS507C X2, about $235
- Best trigger: Timney Alpha Competition for the RXM, under $100
- Best holster: Galco Walkabout 2.0 IWB, about $60
Best first upgrade: Magpul EHG RG9 grip module
Ruger puts the RXM's serial number on a removable Fire Control Insert, so the grip around it is an ordinary part you can order like a magazine. A second Magpul grip turns one pistol into a compact, a full size or a subcompact, and you keep the same slide, optic and zero.
What we like
- Magpul makes it in compact, full size and subcompact sizes, and lists each one at $39.95.
- Every grip ships with a magazine release, springs, a slide lock spring and a takedown pin spring.
- Magpul says most Gen3 Glock magazine release and slide stop parts work with it.
Watch out for
- The swap takes a 3/32 in punch and three pins, so read Ruger's manual before you start.
- It only fits the RXM, because a Glock has no Ruger Fire Control Insert to drop into it.
- Your holster grips the module, so retest the fit every time you change grips.
Best red dot: Holosun HS507C X2
Ruger cut the RXM slide for RMR, DeltaPoint Pro and RMSc footprints, so an RMR pattern dot bolts straight on without the adapter plates a Glock MOS needs. Holosun lists the 507C X2 on the RMR footprint, and most of the big stores we track sell it at the same price.
What we like
- It mounts on Ruger's two RMR dowel pins with no plate in between.
- Holosun's Multi Reticle System gives you a 2 MOA dot, a 32 MOA circle, or both together.
- Holosun rates the battery at up to 50,000 hours on setting 6.
Watch out for
- RMR screws are 6-32, and Ruger's manual says to check they don't bottom out in the slide.
- You'll need thread locker, the optic maker's torque spec and a fresh zero.
- Lipsey's exclusive models 19461 to 19466 are cut for Aimpoint's A-CUT instead, so this dot won't fit those.
Best trigger: Timney Alpha Competition for the RXM
Timney makes this Alpha for the RXM itself, so you aren't relying on the two articles that say Gen3 Glock kits fit. Shoot On's walkthrough shows its sear housing dropping into the RXM's own trigger housing, which sits inside the Fire Control Insert on two studs.
What we like
- The listing says it uses all the stock parts and springs, and the sear housing snaps in.
- It gives you a 3 lb pull with a straight aluminum shoe and a safety blade.
- Timney backs it with a lifetime warranty, and several stores we track have it under $100.
Watch out for
- A 3 lb pull is a competition weight, and the pull isn't adjustable.
- The factory trigger already measured about 4.5 lb for two reviewers and 5.25 lb for Handguns.
- It changes the fire control, so function check the trigger safety and striker safety before you trust it.
Best holster: Galco Walkabout 2.0 IWB
Galco's listing names the Ruger RXM alongside the Glock 19 Gen 1 to 6, so you can carry either pistol in one leather holster. Handguns also fit Bianchi, Safariland and Blackhawk Glock 19 holsters, and Magpul lists most Gen3 holsters for its RXM grips.
What we like
- The listing names the RXM by model, so you aren't guessing from a Glock fit chart.
- It costs about $60, far less than Galco's optics ready Hawkeye.
- The same holster takes a Glock 19 if you also own one.
Watch out for
- This listing is right hand only.
- Firearms News notes the RXM's trigger guard is rounded where a Glock's is square, so retention can feel different.
- Buy the light first, because a weapon light changes which holster will hold the gun.
Want an optics ready holster instead? Galco's Hawkeye also names the RXM, at a much higher price.
How big is the RXM next to a Glock 19?
Ruger sells more than one RXM. The standard model has a 4 in barrel, a 15+1 compact grip and a $539 list price, while the 17+1 models wear a full size grip that stands 5.60 in tall.
The threaded models have a 4.50 in barrel cut 1/2x28, run 7.65 in long and list at $599. Not every 4.50 in RXM is threaded, though. The 17+1 models 19443 and 19444 list at $539 with no threads, and Davidson's exclusive 19468 has none either. Ruger's catalog lists 21 models across four grip colors.
We drew the compact 4 in model against the two Glock 19s you'll see parts sold for. It's 0.21 in shorter than a Gen3 19, and Ruger lists it 0.27 in taller, but Ruger doesn't say what its height figure includes.
Both slides are 1 in wide. Ruger doesn't publish an overall width, so the chart uses the rough 1.1 in Handguns measured, against Glock's 1.26 in. Don't read the width gap in the drawing as real, because the same review called the RXM only about .015 in narrower than a Glock 19.
Ruger doesn't publish a slide length either, so we drew the RXM slide at the Gen3 G19's 6.85 in, since Gen3 G19 slides fit it. Switch on the full size grip model to compare it too.
Ruger RXM vs Glock 19 Gen3 and Gen5, to scale
RXM from Ruger's spec sheets. Ruger doesn't publish a slide length, so the RXM slide is drawn at the Gen3 G19's 6.85 in, since Gen3 G19 slides fit it. Ruger lists slide width only, so the RXM width is Handguns magazine's rough 1.1 in measurement, also assumed for the full size grip row. Handguns also called the RXM only about .015 in narrower than a G19, so the width gap here comes from mixing two measurements. Ruger doesn't say whether its weight includes a magazine. Glock from us.glock.com, read September 27, 2026, weights with an empty magazine.
One square is one inch. Aligned at the slide rear and sight top, the way the guns sit in your hand.
| Pistol | Length (in) | Slide (in) | Height (in) | Width (in) | Weight (oz) | Barrel (in) |
|---|---|---|---|---|---|---|
| Ruger RXM | 7.15 | 6.85 | 5.31 | 1.1 | 23.2 | 4 |
| Glock 19 Gen3 | 7.36 | 6.85 | 5.04 | 1.26 | 23.63 | 4.02 |
| Glock 19 Gen5 | 7.28 | 6.85 | 5.04 | 1.34 | 23.63 | 4.02 |
| RXM, full size grip | 7.15 | 6.85 | 5.6 | 1.1 | 23.4 | 4 |
Why does the chassis matter so much?
On a Glock, the frame is the firearm, so changing the grip means changing the serialized part and doing a transfer. On the RXM, the serialized part is a Fire Control Insert that lifts out of the grip module.
SIG's P320 and Springfield's Echelon use the same idea. SIG calls its part the Fire Control Unit, and Springfield calls its part the Central Operating Group.
You can change the size, the texture and the frame of the pistol without a transfer and without giving up your zero, your slide or your optic. A second grip module is closer in value to a second pistol than its price suggests.
Ruger spec sheets and owner's manual, read September 27, 2026
| Metric | Value |
|---|---|
| Serialized part, not sold alone | FCI |
| Weight, 4 in 15+1 model | 23.2 oz |
| Optic footprints, no plate | 3 |
| List price, 4 in model | $539 |
Ruger's manual calls for a 3/32 in punch with the slide off. Drive out the locking block pin, press the slide lock spring down and push out the slide lock, then drive out the takedown pin and tilt the insert out.
Move the takedown and slide lock springs to the new grip, although Magpul ships fresh ones with every grip anyway. You'll find Ruger's video at Ruger.com/TechTips. Here are the other two Magpul sizes.
Which Glock parts fit the RXM?
Buy Gen3 Glock 19 parts, never Gen5 or V. Ruger's spec sheet says most major components are designed for Gen 3 compatibility, and Shooting Illustrated found almost all the mechanicals interchange with third generation Glocks.
Firearms News adds the catch: parts for later generations won't necessarily work, and some parts may need fitting. You also can't buy the stainless Fire Control Insert on its own, since it carries the serial number and holds the trigger housing, locking block, connector, trigger bar, ejector and slide stop lever.
Pick your gun in the chart below to see what fits, with the reason for each call. Where no published review had tried a part, the chart says unconfirmed rather than guessing.
Which Glock 19 parts fit the RXM
From Ruger's spec sheets and owner's manual, Magpul's RXM grip pages, reviews in Handguns (May 2025), Shooting Illustrated (June 2025), Firearms News (April 2025) and Athlon Outdoors (April 2025), Glock's Gen5 release, and NDZ Performance and Mid State Firearms for Gen5 fit, checked September 27, 2026. The RXM takes Gen3 parts, not Gen5.
8 of 16 fit the Ruger RXM outright, and 4 more fit with a catch.
- Glock 19 Gen3 slide, factory or aftermarketFits, with a catch. Ruger builds it to Gen3 and Shooting Illustrated says almost all mechanicals swap. Firearms News warns some parts need fitting. Function check before you carry it.
- Glock 19 Gen5 or V slideUnconfirmed. Ruger built the RXM to Gen3 and Firearms News says later generation parts won't necessarily work. Nobody we read has tried a Gen5 slide on one, so don't plan on it.
- Glock 19 barrel sold for Gen3Fits, with a catch. Ruger lists Gen3 compatibility. Buy one listed for a Gen3 G19 and check lockup.
- Glock 19 Gen3 recoil spring assemblyUnconfirmed. Ruger and Magpul say major components are Gen3 compatible, but no source we read names the recoil spring.
- Aftermarket Gen3 Glock triggerFits, with a catch. Athlon Outdoors and Safariland say Gen3 Glock 19 trigger kits work. Timney still sells a separate RXM Alpha, so prefer a kit listed for the RXM.
- Glock Gen3 trigger housingUnconfirmed. It sits inside Ruger's serialized Fire Control Insert, which Ruger doesn't sell separately. Nobody we read has swapped one.
- Gen3 magazine release and slide stop partsFits. Magpul lists most Gen3 magazine release and slide stop parts for its RXM grips.
- Glock 19 factory magazine, 15 roundsFits. Ruger lists most Glock style 9mm magazines. Handguns and Shooting Illustrated ran factory Glock magazines with no failures.
- Magpul PMAG 15 GL9Fits. Ships with two.
- PMAG 17 GL9 or Glock 17 magazineFits. Ruger ships two PMAG 17s with the 17+1 full size grip models. In the compact grip it extends below the frame.
- Holster molded for a Glock 19Fits, with a catch. Handguns fit Bianchi, Safariland and Blackhawk G19 holsters. The RXM's trigger guard is rounded, so tight kydex can hold it differently. Test yours.
- RMR, DeltaPoint Pro or RMSc footprint opticFits. Straight to the slide on Ruger's dowel pins: two for RMR, four for DPP or RMSc.
- Glock MOS adapter plateWon't fit. No MOS pocket. The optic bolts straight to the slide.
- Glock pattern sightsFits. Shooting Illustrated: normal Glock dovetail rear, threaded tenon front.
- Weapon light for a Glock railFits. Ruger lists a universal pattern rail. Handguns calls it Glock's universal rail.
- Magpul EHG RG9 grip moduleFits. Compact, full size and subcompact. Magpul lists all three at $39.95.
| Part | Ruger RXM | Glock 19 Gen3 | Glock 19 Gen5 |
|---|---|---|---|
| Slide, barrel and spring: Glock 19 Gen3 slide, factory or aftermarket | Fits, with a catch. Ruger builds it to Gen3 and Shooting Illustrated says almost all mechanicals swap. Firearms News warns some parts need fitting. Function check before you carry it. | Fits. Made for it. | Fits, with a catch. Mid State Firearms calls it a builder's project: a Gen3 recoil spring, a Gen5 back plate, and not factory approved. |
| Slide, barrel and spring: Glock 19 Gen5 or V slide | Unconfirmed. Ruger built the RXM to Gen3 and Firearms News says later generation parts won't necessarily work. Nobody we read has tried a Gen5 slide on one, so don't plan on it. | Does not fit. Mid State Firearms says it takes heavy modification. | Fits. Made for it. |
| Slide, barrel and spring: Glock 19 barrel sold for Gen3 | Fits, with a catch. Ruger lists Gen3 compatibility. Buy one listed for a Gen3 G19 and check lockup. | Fits. Made for it. | Fits, with a catch. Only barrels the maker lists as Gen 3 to 5, like Ballistic Advantage's. |
| Slide, barrel and spring: Glock 19 Gen3 recoil spring assembly | Unconfirmed. Ruger and Magpul say major components are Gen3 compatible, but no source we read names the recoil spring. | Fits. Made for it. | Does not fit. NDZ Performance: Gen 4 and 5 dual springs and Gen 1 to 3 single springs don't interchange. |
| Fire control: Aftermarket Gen3 Glock trigger | Fits, with a catch. Athlon Outdoors and Safariland say Gen3 Glock 19 trigger kits work. Timney still sells a separate RXM Alpha, so prefer a kit listed for the RXM. | Fits. Made for it. | Does not fit. NDZ Performance: Gen5 revised the trigger mechanism, so Gen 1 to 4 connectors don't carry over. |
| Fire control: Glock Gen3 trigger housing | Unconfirmed. It sits inside Ruger's serialized Fire Control Insert, which Ruger doesn't sell separately. Nobody we read has swapped one. | Fits. Made for it. | Does not fit. Gen5 revised the trigger mechanism. |
| Fire control: Gen3 magazine release and slide stop parts | Fits. Magpul lists most Gen3 magazine release and slide stop parts for its RXM grips. | Fits. Made for it. | Does not fit. Glock gave Gen5 an ambidextrous slide stop. |
| Magazines: Glock 19 factory magazine, 15 rounds | Fits. Ruger lists most Glock style 9mm magazines. Handguns and Shooting Illustrated ran factory Glock magazines with no failures. | Fits. Made for it. | Fits. Made for it. |
| Magazines: Magpul PMAG 15 GL9 | Fits. Ships with two. | Fits | Fits |
| Magazines: PMAG 17 GL9 or Glock 17 magazine | Fits. Ruger ships two PMAG 17s with the 17+1 full size grip models. In the compact grip it extends below the frame. | Fits. Glock lists a 17 round option for the 19. | Fits. Glock lists a 17 round option for the 19. |
| Holsters, optics, sights, lights: Holster molded for a Glock 19 | Fits, with a catch. Handguns fit Bianchi, Safariland and Blackhawk G19 holsters. The RXM's trigger guard is rounded, so tight kydex can hold it differently. Test yours. | Fits. Made for it. | Fits. Made for it. |
| Holsters, optics, sights, lights: RMR, DeltaPoint Pro or RMSc footprint optic | Fits. Straight to the slide on Ruger's dowel pins: two for RMR, four for DPP or RMSc. | Does not fit. The Gen3 G19 has no optic cut. You'd need a cut slide. | Fits, with a catch. Only the G19 Gen5 MOS, through Glock's plates. |
| Holsters, optics, sights, lights: Glock MOS adapter plate | Does not fit. No MOS pocket. The optic bolts straight to the slide. | Does not fit. No optic cut. | Fits, with a catch. Only on the G19 Gen5 MOS. |
| Holsters, optics, sights, lights: Glock pattern sights | Fits. Shooting Illustrated: normal Glock dovetail rear, threaded tenon front. | Fits | Fits |
| Holsters, optics, sights, lights: Weapon light for a Glock rail | Fits. Ruger lists a universal pattern rail. Handguns calls it Glock's universal rail. | Fits | Fits |
| RXM only: Magpul EHG RG9 grip module | Fits. Compact, full size and subcompact. Magpul lists all three at $39.95. | Does not fit. Needs Ruger's Fire Control Insert. | Does not fit. Needs Ruger's Fire Control Insert. |
For anything unconfirmed, buy from makers who list the RXM by name, and check fit before you trust the gun.
Slides
A Gen3 G19 slide is the biggest swap on the chart, and it's only a partial fit. Ruger builds to Gen3, but a slide made for a Glock may still need fitting, so function check it before you carry it.
Live Free Armory's LF19 ships as a complete slide, so check whether any other listing is stripped before you order, because a stripped slide needs a Gen3 parts kit. All three below are cut for RMR footprint optics. You'd give up the RXM's DPP and RMSc options.
Barrels
For a new barrel, buy one listed for a Gen3 Glock 19 and check lockup before you shoot it. Ballistic Advantage lists its threaded barrel for Gen 3 to 5, while Agency Arms and Rival Arms list theirs for Gen 3 and 4.
Radian's Afterburner + Ramjet is a barrel and compensator combo, sold in separate Glock, SIG and Ruger versions, and the last card here is the RXM one. If you only want threads, Ruger's threaded 4.50 in models come cut 1/2x28 from the factory, but the 19443, 19444 and 19468 have no threads.
Gen3 Glock trigger kits
Athlon Outdoors says aftermarket trigger kits made for the Gen3 Glock 19 will work, and Safariland's blog says the RXM takes Gen3 Glock triggers. Neither article shows one being installed. If you fit a Glock kit anyway, you're relying on those two articles, so function check it carefully.
Will Glock magazines and extended mags work?
Ruger's manual says the RXM takes most Glock style 9mm magazines. It ships with two Magpul PMAG 15 GL9s, and the 17+1 models ship with PMAG 17s instead.
Shooting Illustrated ran factory Glock, ETS and Magpul magazines with no malfunctions in 600 rounds, and Handguns ran factory Glock 19 magazines without issues. Pew Pew Tactical did log early feeding trouble and two double feeds at 350 rounds, then ran clean to 500.
For an extended mag, a PMAG 17 GL9 or a Glock 17 magazine works. It sticks out below the compact grip and sits as the standard magazine in the full size grip.
Buy a couple, confirm they seat, drop free and feed with your ammunition, and only then buy in quantity.
Why the optic cut beats a Glock's
Take off the cover plate with the supplied IP10 or T10 wrench, then drop Ruger's dowel pins into the holes that match your optic. An RMR takes two pins, and a DPP or an RMSc takes four.
DPP and RMSc screws are M4, so check those don't bottom out either. Holosun lists the 507K on its own K footprint and doesn't name RMSc on its page, so ask the seller whether it fits an RMSc cut before you order.
Mounting straight to the slide removes the plate, and plates are the usual thing that works loose on a pistol optic. If you've fought with Glock MOS plates, you'll like this.
Which light fits the RXM?
The RXM uses what Ruger calls a universal pattern rail, the same slot rail as a Glock, so the common rail mounted pistol lights fit. Viridian sells an RXM listing of its CTL, a 580 lumen light, for around $110.
What order should you buy upgrades in?
Here's the order we'd buy in.
- An optic, since the multi footprint cut makes it easy.
- A light, if the pistol has any defensive role.
- A holster, bought after the light and the optic are fitted.
- A second grip module, the one upgrade here a Glock owner can't make without buying a new frame.
- Fire control parts, from makers who list the RXM, and function checked properly.
- Sights, last or never. Standard RXMs ship a tritium front and a drift adjustable steel rear on a Glock dovetail, and Lipsey's A-CUT models have a plain steel front.
How we pick
We read Ruger's spec sheets and owner's manual, the maker pages for each part, and reviews in Handguns, Shooting Illustrated, Firearms News and Pew Pew Tactical. Prices come from the stores we track, rounded, and every pick names the RXM or comes from a maker's own fit list.
Coming from a Glock? Our Glock 19 upgrade guide covers the parts logic that carries over, and the red dot plate guide explains the plate system the RXM avoids.
Filed underGlock/Holsters/Triggers/Optics/Buyer's Guide
FAQ
Frequently asked questions
Do Glock parts fit the Ruger RXM?
- Many do, as long as they're Gen3 Glock 19 parts. Ruger says most major components are designed for Gen 3 compatibility, and Shooting Illustrated found almost all the mechanicals interchange. Firearms News warns that later generation parts won't necessarily work and some parts may need fitting, so we'd buy fire control parts from makers who list the RXM and function check anything you swap.
Does the Ruger RXM take Glock 19 magazines?
- Yes. Ruger's manual says it takes most Glock style 9mm magazines, and it ships with two Magpul PMAG 15 GL9s. Shooting Illustrated ran factory Glock, ETS and Magpul magazines and all worked, and the pistol had no malfunctions in 600 rounds. Handguns ran factory Glock 19 magazines without issues. Test a couple before you buy in bulk.
What makes the Ruger RXM different from a Glock?
- The serial number is on a removable fire control insert rather than the frame, the same idea as the SIG P320 and Springfield Echelon. That means the grip module is an ordinary part you can buy and swap, so you can run one pistol as full size, compact or subcompact without a transfer.
How hard is it to change the RXM grip module?
- Ruger's manual calls for a 3/32 in punch. With the slide off, you drive out the locking block pin, push out the slide lock, drive out the takedown pin and tilt the Fire Control Insert out, then move the takedown and slide lock springs to the new grip. Magpul includes fresh springs with each grip, and Ruger has a video at Ruger.com/TechTips.
What optics fit the Ruger RXM?
- Anything on the RMR, DeltaPoint Pro or RMSc footprint, with no adapter plate. You drop Ruger's dowel pins into the matching holes, two for an RMR and four for a DPP or RMSc, and screw the optic straight to the slide. Lipsey's exclusive models 19461 to 19466 are cut for Aimpoint's A-CUT pattern instead.
Will Glock 19 holsters fit the Ruger RXM?
- Most will. Handguns fit Bianchi, Safariland and Blackhawk Glock 19 holsters, and Magpul lists most Gen3 holsters for its RXM grips. The RXM's trigger guard is rounded rather than squared like a Glock's, so retention can differ in tightly molded kydex. We'd test the specific holster, and retest if you swap grip modules.
Can I put a Glock 19 Gen5 slide on a Ruger RXM?
- Don't plan on it. The RXM is built to Gen3, and Firearms News says later generation parts won't necessarily work. Gen5 revised the trigger mechanism, and nobody we read has tried a Gen5 slide on an RXM. Buy a slide made for a Gen3 Glock 19, and function check it before you carry it.
What extended magazines fit the Ruger RXM?
- The Magpul PMAG 17 GL9 and Glock 17 magazines. Ruger ships two PMAG 17s with its 17+1 full size grip models. In the compact grip, a 17 round magazine sticks out below the frame.
Does the Ruger RXM come with a threaded barrel?
- The threaded models do. They have a 4.50 in barrel cut 1/2x28 and list at $599. Not every 4.50 in model is threaded: the 17+1 models 19443 and 19444 list at $539 with no threads, and Davidson's exclusive 19468 has none either. The standard 4 in model isn't threaded and lists at $539. For a 4 in RXM, a threaded barrel listed for a Gen3 Glock 19 is the usual route, but check lockup before you shoot it.
Where is the serial number on the Ruger RXM?
- On the stainless Fire Control Insert, the chassis that lifts out of the grip module. It holds the trigger housing, locking block, connector, trigger bar, ejector and slide stop lever. Ruger defines it as the firearm and doesn't sell it as a separate part.
What trigger upgrades fit the Ruger RXM?
- We'd buy one listed for the RXM, such as Timney's RXM Alpha Competition. Athlon Outdoors and Safariland say Gen3 Glock 19 trigger kits work, but neither shows one installed, and Timney still makes a separate RXM version. If you fit a Glock kit, function check it before you carry.
Written by
GPP Editorial TeamAR Build Specialists
GunPartPicker guides are powered by data from real builds. What builders actually select tells the story.
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Tools for this guide
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