Does the Colt M4 Commando 5.56mm Semi-Auto work with the Colt M4 LE6921ERP Upper Group 14.5in?
Lower Receiver
Colt M4 Commando 5.56mm Semi-Auto
from $449.99
Upper Receiver
Colt M4 LE6921ERP Upper Group 14.5in
from $930.27
Colt lower and Colt upper compatibility
Yes, they fit
The Colt M4 Commando 5.56mm Semi-Auto works with the Colt M4 LE6921ERP Upper Group 14.5in. 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 Colt lower and Colt 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%
- This pairColt M4 LE6921ERP Upper Group 14.5in1.0%
Share of builds with the Colt M4 LE6921ERP Upper Group 14.5in and any lower
- This pairColt M4 Commando 5.56mm Semi-Auto33%
Colt M4 Commando 5.56mm Semi-Auto
- Of lower picks
- 0.7%
- Median paid
- $450
Colt M4 LE6921ERP Upper Group 14.5in
- Of upper picks
- 0%
- Median paid
- $930
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 Colt 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 Colt M4 LE6921ERP Upper Group: specs and prices
| Colt M4 Commando 5.56mm | Colt M4 LE6921ERP Upper | |
|---|---|---|
| Best price | $449.99 at Palmetto State Armory | $930.27 at BattleHawk Armory |
| Stores | 0 of 1 in stock | 3 of 4 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 $1380.26 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.
- Colt M4 LE6921ERP Upper Group 14.5in: lowest $886.99 on Jul 5, highest $1093.99 on Aug 24 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 Colt uppers
The Colt M4 LE6921ERP Upper Group 14.5in is not in enough builds yet, so these are the most picked next to any Colt upper. Only parts our rules say fit the Colt M4 LE6921ERP Upper Group 14.5in are listed.
