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Colt
Overview
The Colt AR15A4 Buffer Retainer is designed specifically for use with Mil-Spec carbine buffer tubes, ensuring a secure and reliable fit for your AR-15 build. This component plays a critical role in retaining the buffer within the buffer tube, allowing for smooth cycling and reliable operation of your firearm. You'll commonly find this buffer retainer in builds that prioritize Mil-Spec components for compatibility and performance.
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Based on build data

Strike Industries Extended Bolt Catch
Bolt Catch
Law Tactical AR Folding Stock Adapter Gen 3 - HK
Stock Adapter
Expo Arms Ar-15 Carbine Buffer Spring - 17-7 Steel
Buffer Spring
Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C
Buffer Spring
Strike Industries Cobra Billet Aluminum Trigger Guard - Red
Trigger Guard
Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK
Takedown PinAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Strike Industries Extended Bolt Catch | Bolt Catch | 72 |
| Law Tactical AR Folding Stock Adapter Gen 3 - HK | Stock Adapter | 71 |
| Expo Arms Ar-15 Carbine Buffer Spring - 17-7 Steel | Buffer Spring | 65 |
| Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C | Buffer Spring | 58 |
| Strike Industries Cobra Billet Aluminum Trigger Guard - Red | Trigger Guard | 53 |
| Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK | Takedown Pin | 53 |
| Platform | Percentage |
|---|---|
| AR-15 | 80.5% |
| AR-10 | 18.1% |
| AR-9 | 1.4% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 69.2% |
| .223 Wylde | 11.8% |
| 300 Blackout | 7.6% |
| .308 Win | 4.5% |
| .450 Bushmaster | 2.1% |
| 6mm ARC | 1.4% |
| .458 SOCOM | 1.4% |
| 6.5 Grendel | 1% |
| 7.62x39mm | 0.7% |
| .224 Valkyrie | 0.3% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 44.6% |
| Carbine | 28.7% |
| Rifle | 16.3% |
| Pistol | 10% |
| Intermediate | 0.4% |
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