Does the Knights Armament Sr-15 Iws work with the Knights Armament Lpr Mod 2 18" Urx 4?
Lower Receiver
Knights Armament Sr-15 Iws
from $959.31
Upper Receiver
Knights Armament Lpr Mod 2 18" Urx 4 M-LOK
from $2172.99
Knights Armament lower and Knights Armament upper compatibility
Yes, they fit
The Knights Armament Sr-15 Iws works with the Knights Armament Lpr Mod 2 18" Urx 4 M-LOK. Our compatibility rules found no conflict between them.
This exact setup is in a real GunPartPicker build.
Counted from real GunPartPicker builds: parts lists people put together while planning to buy.
Checked by the same rules the AR builder runs on every part you add: caliber, frame size, receiver pattern, thread pitch and gas length.
Fit is judged from the specs retailers list, which can be missing or wrong. Confirm with the manufacturer before you buy, and have a qualified gunsmith check any build before you fire it.
How often builders pair the Knights Armament lower and Knights Armament upper
Backed by tens of thousands of qualified builds that have both a lower and an upper.
Share of builds with the Knights Armament Sr-15 Iws and any upper
- This pairKnights Armament Lpr Mod 2 18" Urx 4 M-LOK2%
Share of builds with the Knights Armament Lpr Mod 2 18" Urx 4 and any lower
- This pairKnights Armament Sr-15 Iws33%
Knights Armament Sr-15 Iws
- Of lower picks
- 0.3%
- Median paid
- $959
Knights Armament Lpr Mod 2 18" Urx 4
- Of upper picks
- 0%
- Median paid
- $2173
How we count ⌄
These shares come from GunPartPicker's build data: real parts lists people put together while planning a purchase, not sales or surveys. A build counts a part only when it is the final pick for its slot, so parts that were swapped out never count. Fit never comes from these numbers; it comes from our compatibility rules alone.
Frequently built with the Knights Armament lower and Knights Armament upper
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Stock & Brace
Charging Handle
Muzzle Device
Bolt Carrier Group
Daniel Defense Bolt/carrier Group
Fits both
Rifle Scope
Pistol Grip
Knights Armament Sr-15 Iws vs Knights Armament Lpr Mod 2 18": specs and prices
| Knights Armament Sr-15 Iws | Knights Armament Lpr Mod 2 | |
|---|---|---|
| Best price | $959.31 at BattleHawk Armory | $2172.99 at Brownells |
| Stores | 0 of 3 in stock | 0 of 2 in stock |
| Assembly | Complete | Complete |
| Platform | AR-15 | AR-15 |
| Caliber | 5.56 NATO | 5.56 NATO |
| Trigger Pin | .154 | n/a |
| Finish | Hardcoat Anodized | n/a |
| Color | Black | n/a |
| Length | n/a | 18 |
Both for $3132.30 at today's best prices.
Today's best prices and 90 day price history
Every store we track for each part, cheapest in stock first. Prices are checked through the day.
Price history, last 90 days
- Knights Armament Sr-15 Iws: lowest $1099.99 on Jul 6, highest $1249.99 on Jul 5 over the last 90 days.
- Knights Armament Lpr Mod 2 18" Urx 4: lowest $2172.99 on Jul 6, highest $2172.99 on Jul 6 over the last 90 days.
Upper Receivers frequently paired with the Knights Armament Sr-15 Iws
Most picked next to it in real builds. Only parts our rules say fit the Knights Armament Sr-15 Iws are listed.
Lower Receivers most paired with Knights Armament uppers
The Knights Armament Lpr Mod 2 18" Urx 4 is not in enough builds yet, so these are the most picked next to any Knights Armament upper. Only parts our rules say fit the Knights Armament Lpr Mod 2 18" Urx 4 are listed.
