AR Build Cost Calculator: How Much Does It Cost to Build an AR-15?
How much does it cost to build an AR-15? Pick caliber, barrel length, stock or brace and optic, then drag both edges of the price band from the cheap end to the top end. Every slot fills with the part builders add most that is in stock, priced live. The headline total is the core rifle, optics and extras are priced separately, and beside them sits what builders really pay per slot, measured from real part picks. Roll a random build, or open yours in the builder in one click. Computed from over 1 million AR parts selected on GunPartPicker since 2020.
Quick answer
- The 14 core parts of a 14.5" 5.56 NATO AR-15, in stock and picked from the 25 to 75 percentile of what fits in each slot (around the median), cost $1,468 on GunPartPicker as of October 23, 2026.
- The cheapest in stock core build that fits the same selections is $383.
- Priced at what builders actually pay in each slot, the same core build is $1,949. That is the median price at the moment real builders selected each part on GunPartPicker.
- Recent public GunPartPicker builds with a 14.5" 5.56 NATO barrel have a median parts total of $1,865 at today's best merchant prices.
Source: GunPartPicker catalog and build data, prices checked October 23, 2026.
How much does it cost to build a 14.5" 5.56 NATO AR-15?
Drag both edges of the price band and every slot refills with the part builders add most that is in stock, fits, and sits inside that slice. The headline is the core rifle; optics and extras are priced on their own line. Beside it, what builders really pay in each slot, from real part picks on GunPartPicker.
Rifle
AR-15 receivers, 1/2x28 muzzle thread.
Calls for a mid-length gas tube.
Sets the gas block journal: .750 with this profile.
Override only if the barrel you want is drilled for a different length.
Drag both edges. The band is a slice of the parts that actually fit these selections, slot by slot, not of the whole catalog: 50 is the median part in that slot.
Upper receiver options
Must clear the muzzle device and cover the gas block.
Threaded 1/2x28 either way.
Lower receiver options
Applies to the lower and the upper.
Optics, extras and finish
Only used when the optic is an LPVO or a scope.
A preference, not a filter: parts in this color win ties, black fills in where nothing else is in stock.
Core rifle, around the median
$1,468
14 of 14 core slots, no optic or light
What builders actually pay
$1,949
median price when builders picked each part
Cheapest in stock
$383
the lowest priced part that fits, every core slot
Real builds like this
$1,865
median total of recent public builds with this barrel
Opens these picks in the AR-15 Builder as a saved build named above, priced at $1,414 today, ready to swap parts, share, or buy. Not carried over: lower parts kit (the builder has no slot for it; add it from the product page).
AR-15 parts list: 14.5" 5.56 NATO, around the median, priced October 23, 2026
One part per slot: among in stock parts inside the price band, the one builders add to real builds most, then the most reviewed, then the cheapest. Each note carries the median price builders really paid for that slot. Open any card for every merchant price.
- 01Stripped lower receiverIn your band
Griffin ArmamentGriffin Armament MK2 Ambi Stripped AR-15 Lower Receiver - Ambidextrous Controls - Flared Magwell - Anodized Black - MK2AL$208.95In stockThe serialized part. Ships to an FFL; the transfer fee is not in the total. Builders who filled this slot paid a median of $218.139 that fit → - 02Lower parts kitIn your band
Sons of Liberty Gun WorksSons of Liberty Gun Works Blaster Starter Kit AR-15 LPK - No Grip/Trigger$54.15In stockPins, springs, detents, selector, bolt catch, mag release, usually a mil-spec trigger and grip. Lower build kits that bundle a stock and buffer tube are left out so nothing is counted twice. Builders who filled this slot paid a median of $218.14 that fit → - 03TriggerIn your band
Rise ArmamentRise Armament Super Sporting Ar15/10 Single Stage Trigger - Flat - Dtom Special Edition$108.09In stockA mil-spec trigger comes in most parts kits; this slot is the upgrade most builders actually buy. Builders who filled this slot paid a median of $167.467 that fit → - 04Pistol gripIn your band
Wilson CombatWilson Combat Ar-15 Starburst Gunfighter Pistol Grip Black$25.32In stockBuilders who filled this slot paid a median of $20.523 that fit → - 05Buffer tube assemblyIn your band
KAK IndustryKAK Industry Mil-Spec Carbine Buffer Tube Kit, Black$41.85In stockTube, buffer, spring, castle nut and end plate. A carbine tube for a collapsible stock or a brace, a rifle tube for a fixed stock. Builders who filled this slot paid a median of $72.85 that fit → - 06Stock or braceIn your band
SB TacticalSB Tactical SBA3 5 Position Adjustable Arm Brace Buffer Tube Not Included, Black - SBA3X-01-SB$99.99In stockMil-spec tube diameter. A fixed A2 stock wants the rifle tube above. Builders who filled this slot paid a median of $53.79 that fit → - 07Stripped upper receiverIn your band
Palmetto State ArmoryPSA AR-15 Built Stealth Upper Receiver - No T Marks - 516444539$99.99In stockStripped, so the barrel, handguard, gas system, BCG and charging handle are chosen below. Builders who filled this slot paid a median of $400.104 that fit → - 08BarrelIn your band
Criterion BarrelsCriterion Barrels Inc Barrel 223 Wylde 14.5" 1-8 Mid-Length Black$297.99In stockLength read from the product name. The gas length that suits the barrel sets the gas tube below. Builders who filled this slot paid a median of $200.50 that fit → - 09Gas blockIn your band
Sons of Liberty Gun WorksSons of Liberty Gun Works Gas Block V2 - .750"$45.00In stockJournal follows the barrel profile: .750 on government, M4 and heavy profiles, .625 on pencil and lightweight barrels. Check the barrel listing. Builders who filled this slot paid a median of $50.217 that fit → - 10Gas tubeIn your band
WMD GunsWmd Guns Ar-15 Gas Tube Nitromet Mid-Length$14.40In stockMatched to the gas length in play: your override, or the one the barrel length calls for. Builders who filled this slot paid a median of $16.44 that fit → - 11HandguardIn your band
Midwest IndustriesMidwest Industries Suppressor Series M-Lok Ar-15 Handguard - 15"$174.95In stockOne half inch to three and a half inches shorter than the barrel, so the muzzle device clears and the gas block is covered. M-LOK preferred. Builders who filled this slot paid a median of $175.188 that fit → - 12Muzzle deviceIn your band
ZEV TechnologiesZev Technologies 5.56 Muzzle Device - 1/2x28$48.02In stockThread and caliber matched to the barrel. Builders who filled this slot paid a median of $73.370 that fit → - 13Bolt carrier groupIn your band
Bravo CompanyBravo Company M16 Bolt Carrier Group Black$199.00In stock.300 Blackout runs the 5.56 BCG. AR-10 carriers are pattern specific; check DPMS versus Armalite fit against the upper. Builders who filled this slot paid a median of $199.164 that fit → - 14Charging handleIn your band
Breek ArmsBreek Arms Ar-15 Warhammer Mod2 Ambidextrous Charging Handle Black$49.95In stockBuilders who filled this slot paid a median of $89.408 that fit →
Real 14.5" 5.56 NATO AR-15 builds and what they cost today
Public builds on GunPartPicker with the same platform, caliber and barrel length, priced at today's best merchant price for every part. Fuller builds first. Open one to see the whole parts list.
14.5"
35 parts · Aero Precision
$3,451
DMR 14.5"
33 parts · Aero Precision
$2,968
2-gun 14.5" 5.56
32 parts · Aero Precision
$3,999
new 5.56 build
32 parts · Aero Precision
$3,999
SBR 14.5" 5.56
30 parts · Aero Precision
$5,689
for the family fun 14.5"
30 parts · Radian Weapons
$3,729
Your pick vs the cheapest vs what builders really pay
Your pick beside the cheapest and the median in stock part that fits the same slot, and beside the price builders actually paid for that slot, so you can see where the money really goes.
| Slot | Pick | Pick price | Cheapest that fits | Median that fits | What builders pay |
|---|---|---|---|---|---|
| Stripped lower receiver | Griffin Armament MK2 Ambi Stripped AR-15 Lower Receiver - Ambide | $209 | $40 | $160 | $218 |
| Lower parts kit | Sons of Liberty Gun Works Blaster Starter Kit AR-15 LPK - No Gri | $54 | $34 | $60 | $218 |
| Trigger | Rise Armament Super Sporting Ar15/10 Single Stage Trigger - Flat | $108 | $16 | $150 | $167 |
| Pistol grip | Wilson Combat Ar-15 Starburst Gunfighter Pistol Grip Black | $25 | $8 | $25 | $20 |
| Buffer tube assembly | KAK Industry Mil-Spec Carbine Buffer Tube Kit, Black | $42 | $20 | $45 | $72 |
| Stock or brace | SB Tactical SBA3 5 Position Adjustable Arm Brace Buffer Tube Not | $100 | $25 | $101 | $53 |
| Stripped upper receiver | PSA AR-15 Built Stealth Upper Receiver - No T Marks - 516444539 | $100 | $42 | $140 | $400 |
| Barrel | Criterion Barrels Inc Barrel 223 Wylde 14.5" 1-8 Mid-Length Blac | $298 | $76 | $215 | $200 |
| Gas block | Sons of Liberty Gun Works Gas Block V2 - .750" | $45 | $10 | $44 | $50 |
| Gas tube | Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length | $14 | $7 | $15 | $16 |
| Handguard | Midwest Industries Suppressor Series M-Lok Ar-15 Handguard - 15" | $175 | $31 | $179 | $175 |
| Muzzle device | Zev Technologies 5.56 Muzzle Device - 1/2x28 | $48 | $10 | $55 | $73 |
| Bolt carrier group | Bravo Company M16 Bolt Carrier Group Black | $199 | $52 | $160 | $199 |
| Charging handle | Breek Arms Ar-15 Warhammer Mod2 Ambidextrous Charging Handle Bla | $50 | $12 | $61 | $89 |
| Core total | 14 of 14 core slots | $1,468 | $383 | $1,411 | $1,949 |
The last column is not a catalog number. It is the median price on screen at the moment a builder added a part to that slot on GunPartPicker. Where it sits well above the cheapest column, builders are choosing to spend there.
How the parts are chosen from real build data
Every slot starts from the in stock parts in its category. The selections filter that set to what physically fits: barrels by caliber and length (read from the product name, which is what the merchant actually sells), the gas tube by the gas length that barrel length calls for, the handguard by a length that clears the muzzle device and covers the gas block, the muzzle device by thread and caliber, the bolt carrier by cartridge, the mount by the scope's tube diameter.
Popularity is not a guess. It comes from over 1 million AR parts selected on GunPartPicker since 2020: every time a builder adds a part to a build it counts, and that is the number each slot is ranked by. The price band then keeps a slice of what fits, by percentile, computed for that slot and these selections: drag the lower edge to 0 and the upper edge to 100 and you get everything, put both handles either side of 50 and you get the median part. Inside the band the pick is the part builders add to real GunPartPicker builds most often, then the most reviewed, then the cheapest. If the band is empty the slot falls back to everything that fits and says so.
The “what builders pay” column is a second, independent measurement. Every time someone adds a part to a build we record the price that was on screen at that moment, so the median of that column is what people really spend on a trigger or a handguard, not what the catalog averages. A slot only reports it once it has at least thirty real picks behind it in the last twelve months; the rest read n/a rather than borrow a catalog number.
The headline total is the core rifle: the fourteen parts it does not fire without. An optic, a mount, backup sights and a light are real money but they are not the build, so they get their own total. That is also how build completion is measured on GunPartPicker, which keeps the number here and the number in the builder talking about the same thing.
The real builds section is the check on the whole thing: public builds with the same platform, caliber and barrel length, each priced at today's best merchant price for every part in it. That is the difference from a price range table. The totals are real carts of real parts at today's prices, and they change when a part sells out.
Roll a random build
A whole configuration from one number: caliber, barrel, back end, optic and price band, weighted towards what people actually configure. Each roll is a plain link with the seed in the URL, so the build you rolled is the build anyone you send it to sees.
- 16" .308 Win, collapsible stock, red dot, around the medianRoll it →
- 16" .300 Blackout, collapsible stock, LPVO, top endRoll it →
- 18" 5.56 NATO, collapsible stock, no optic, around the medianRoll it →
Rolls are computed on the server from the seed, so they are shareable and the same every time. Change anything afterwards and the form takes over.
What an AR build cost does not include
- Magazines and iron sights
- The FFL transfer fee on the lower
- Sales tax and shipping
- Armorer's wrench, vise block, punches, torque wrench
- Lubricant and the ammo to zero it
- A sling, a light, and everything else on the rail
Price it here, build it in the AR-15 Builder
Opens these picks in the AR-15 Builder as a saved build named above, priced at $1,414 today, ready to swap parts, share, or buy. Not carried over: lower parts kit (the builder has no slot for it; add it from the product page).
The AR-15 Builder checks caliber, platform, gas length, thread and mounting compatibility on every slot as you add parts, saves the build, and prices it across every merchant we track. The AR-10 and AR-9 builders check frame size and caliber the same way, so a small frame part on an AR-10 or a 5.56 barrel on a 9mm lower gets flagged. Open any card above and add it from the product page, or start from a community build and swap the parts you would change.
Frequently Asked Questions
What does it cost to build an AR-15 in 2026?
This calculator prices it live from today's in stock parts. Set the caliber and barrel length above, drag the price band, and read the totals: the core rifle from your band, what builders actually pay for those slots, and the cheapest in stock parts that fit. All of them move daily with merchant prices, which is why this page does not print a fixed number in its text.
Is it cheaper to build an AR-15 or buy one?
Buying wins at the bottom of the market. A complete budget rifle usually undercuts the cheapest parts build because the maker buys barrels and receivers by the thousand. Building wins once you want a specific barrel, trigger or handguard, because you pay for the parts you care about and mil-spec for the rest.
What parts does a complete AR-15 build need?
Stripped lower, lower parts kit, trigger, pistol grip, buffer tube assembly, stock or brace, stripped upper, barrel, gas block, gas tube, handguard, muzzle device, bolt carrier group and charging handle. That is the list this calculator fills. An optic and mount are optional slots.
What is not in the total?
Magazines, iron sights, the FFL transfer fee on the lower, sales tax and shipping, the armorer's wrench, vise block and punches, lubricant, and ammo to zero it.
How are the parts chosen?
Each slot is filtered to what fits your selections: barrel by caliber and length, gas tube by the gas length that barrel calls for, handguard by length, muzzle device by thread, BCG by cartridge, mount by scope tube. The price band then keeps a slice of that set by percentile, computed for that slot: put both handles either side of 50 and you get the median part, drag them to the ends and you get everything. Inside the band the pick is the part builders add most, then the most reviewed, then the cheapest. Only in stock parts are considered.
What does the price band do?
It has two edges, both draggable, and it works on percentiles rather than dollars. The parts that fit a slot are sorted by price and the band keeps the slice between your two handles, so 0 to 25 is the cheap quarter of what fits that slot and 40 to 60 is the parts either side of the median. It is computed per slot for your selections, not over the whole catalog, so a budget 16 inch 5.56 barrel means the cheap end of 16 inch 5.56 barrels.
What do builders actually pay for each part?
Every time someone adds a part to a build on GunPartPicker we record the price that was on screen at that moment. The median of those prices, per slot, is the last column of the money table and the second headline total. It is a different measurement from the catalog: it says what people choose to spend on a trigger or a handguard, not what triggers average. A slot reports it only once it has at least thirty real picks in the last twelve months.
Why is the headline total lower than everything added up?
The headline is the core rifle: the fourteen parts it does not fire without. An optic, a mount, backup sights and a light are real money but they are not the rifle, so they are totalled on their own line and added in a separate figure. That is also how a finished build is counted on GunPartPicker, so the two numbers agree.
What does rolling a random build do?
It fills every selection from one seed: caliber, barrel length, back end, optic and price band, weighted towards what people actually configure. The seed goes in the URL, so the build you rolled is the build anyone you send the link to sees, and changing any control afterwards takes over from the roll.
Why is a slot empty?
Nothing in stock matches the selections. Lower parts kits and short barrels go in and out of stock week to week. Widen the price band, try the next barrel length, and check the products page for that category.
Can I buy a complete lower and just build the upper?
Yes, and it is often the cheaper path. A complete lower replaces the lower, parts kit, grip, buffer tube and stock slots. Add those five prices up and compare them to a complete lower on the products page.
Do I need a gunsmith to assemble it?
No. An armorer's wrench, a vise with an upper receiver block and a torque wrench cover the upper. The only precision step is torquing the barrel nut and timing the gas tube hole. The lower is pins, springs and a castle nut.
Cite this tool: GunPartPicker, “AR Build Cost Calculator: How Much Does It Cost to Build an AR-15?”, https://gunpartpicker.net/tools/ar-build-cost-calculator. Data from the GunPartPicker catalog and real community builds, prices checked October 23, 2026. Free to cite with attribution.
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