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CMMG
Overview
The CMMG AR-15 Ejection Port Cover Kit is a critical component for keeping debris out of your chamber, ensuring reliable function during operation. Made from durable steel and finished in a sleek black, this cover provides both protection and a clean look to your build. It is commonly found in builds featuring a blowback gas system and chambered in 5.56 NATO, making it a practical choice for those configurations.
Based on build data
Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black
Gas Block
Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length
Gas Tube
Radian Forward Assist - 7075 Aluminum - Black
Forward Assist
Wmd Guns Nitromet Ar-15 Bolt Catch
Bolt Catch
Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK
Takedown Pin
Magpul AFG-2 Angled Fore Grip - Black
ForegripAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black | Gas Block | 98 |
| Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length | Gas Tube | 92 |
| Radian Forward Assist - 7075 Aluminum - Black | Forward Assist | 83 |
| Wmd Guns Nitromet Ar-15 Bolt Catch | Bolt Catch | 67 |
| Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK | Takedown Pin | 66 |
| Magpul AFG-2 Angled Fore Grip - Black | Foregrip | 64 |
| Platform | Percentage |
|---|---|
| AR-15 | 86.9% |
| AR-10 | 11% |
| AR-9 | 2.1% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 65.6% |
| .223 Wylde | 16.4% |
| 300 Blackout | 6.4% |
| .308 Win | 4.6% |
| 6mm ARC | 1.2% |
| .450 Bushmaster | 1.2% |
| 6.5 Grendel | 0.8% |
| 7.62x39mm | 0.6% |
| 9mm | 0.6% |
| .223 Remington | 0.6% |
| .458 SOCOM | 0.4% |
| 7.62x51 NATO | 0.4% |
| .50 Beowulf | 0.4% |
| .204 Ruger | 0.2% |
| .22 ARC | 0.2% |
| 6.8 SPC II | 0.2% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 46.4% |
| Carbine | 27.3% |
| Rifle | 15.8% |
| Pistol | 9.3% |
| Intermediate | 0.5% |
| Blowback | 0.5% |
| Proprietary | 0.3% |
Builds in the community that include the Ar-15 Ejection Port Cover Kit
| Build | Parts | Total |
|---|---|---|
 | 26 | $1801.49 |
 | 19 | $584.54 |
 | 19 | $1072.19 |
 | 16 | $901.20 |
 | 21 | $1098.19 |
 | 25 | $1048.10 |
 | 19 | $645.53 |
2 global ratings
CMMG ejection port cover kit drops in to a standard upper without any fitting. Comes complete with rod, spring, and c-clip preassembled. Spring tension is correct, snaps door open on bolt cycling. Solid budget cover replacement.
CMMG ejection port cover kit comes complete with rod, spring, and c-clip preassembled. Drop in install once the upper is stripped down. Spring tension correct, snaps the cover open positively on bolt cycling. Black phosphate matches mil-spec uppers.
