Does the Colt M4 Commando 5.56mm Semi-Auto work with the Knights Armament SR-15 KS-2 5.56 NATO?
Lower Receiver
Colt M4 Commando 5.56mm Semi-Auto
from $449.99
Upper Receiver
Knights Armament SR-15 KS-2 5.56 NATO 14.5" BBL Assembled
from $1710.00
Colt lower and Knights Armament upper compatibility
Yes, they fit
The Colt M4 Commando 5.56mm Semi-Auto works with the Knights Armament SR-15 KS-2 5.56 NATO 14.5" BBL. Our compatibility rules found no conflict between them.
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 Colt 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 Colt M4 Commando 5.56mm Semi-Auto and any upper
- Colt M44%
Colt M4 Commando 5.56mm Semi-Auto
- Of lower picks
- 0.7%
- Median paid
- $450
Knights Armament SR-15 KS-2 5.56 NATO
Not in enough builds yet to report.
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 Colt 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.
Trigger
Stock & Brace
Charging Handle
Radian Raptor & Talon Safety Selector Combo
Unconfirmed
Bolt Carrier Group
Fits both
Suppressor
Colt M4 Commando 5.56mm vs Knights Armament SR-15 KS-2: specs and prices
| Colt M4 Commando 5.56mm | Knights Armament SR-15 KS-2 | |
|---|---|---|
| Best price | $449.99 at Palmetto State Armory | $2499.99 at BattleHawk Armory |
| Stores | 0 of 1 in stock | 1 of 2 in stock |
| Assembly | Complete | Complete |
| Platform | AR-15 | AR-15 |
| Caliber | 5.56 NATO | 5.56 NATO |
| Receiver Type | n/a | M4 |
| Length | n/a | 14.5 |
Both for $2949.98 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
- Colt M4 Commando 5.56mm Semi-Auto: lowest $449.99 on Aug 24, highest $449.99 on Aug 24 over the last 90 days.
- Knights Armament SR-15 KS-2 5.56 NATO: lowest $1710.00 on Jul 6, highest $1710.00 on Jul 6 over the last 90 days.
Upper Receivers frequently paired with the Colt M4 Commando 5.56mm Semi-Auto
Most picked next to it in real builds. Only parts our rules say fit the Colt M4 Commando 5.56mm Semi-Auto are listed.
Lower Receivers most paired with Knights Armament uppers
The Knights Armament SR-15 KS-2 5.56 NATO 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 SR-15 KS-2 5.56 NATO are listed.
