this thing is a tank. mounting was straightforward and held zero through a long range day




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Expo Arms
Overview
The Expo Arms 5.56 NATO Complete Mil-Spec M16 / AR-15 Bolt Carrier Group features a chrome finish that enhances both durability and ease of maintenance. Designed in the M16 style, this BCG is built to function reliably in mid-length gas systems, ensuring smooth cycling and optimal performance. You'll commonly find this component in builds that prioritize precision and reliability, particularly those chambered in 5.56 NATO.
Based on build data

Strike Industries Extended Bolt Catch

Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom
Lower Receiver
Wilson Combat Ar-15 Billet Upper Receiver
Upper Receiver
Yankee Hill Machine Ar-15 Billet Upper Receiver - Stripped
Upper Receiver
DFA Modified Cycle System (MCS) RIFLE CALIBER with Right Side Folding Stock - Adaptor GEN 2
Stock Adapter
Faxon Firearms 16" Gov't/socom 5.56 Nato Mid-Length 4150 Qpq
Aggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Strike Industries Extended Bolt Catch | 4 | |
| Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom | Lower Receiver | 3 |
| Wilson Combat Ar-15 Billet Upper Receiver | Upper Receiver | 2 |
| Yankee Hill Machine Ar-15 Billet Upper Receiver - Stripped | Upper Receiver | 2 |
| DFA Modified Cycle System (MCS) RIFLE CALIBER with Right Side Folding Stock - Adaptor GEN 2 | Stock Adapter | 2 |
| Faxon Firearms 16" Gov't/socom 5.56 Nato Mid-Length 4150 Qpq | 2 |
| Platform | Percentage |
|---|---|
| AR-15 | 69.2% |
| AR-10 | 23.1% |
| AR-9 | 7.7% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 75% |
| .223 Wylde | 8.3% |
| .308 Win | 8.3% |
| 300 Blackout | 8.3% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 41.7% |
| Carbine | 33.3% |
| Rifle | 16.7% |
| Pistol | 8.3% |
Builds in the community that include the Expo Arms 5.56 Nato Complete Mil-Spec M16 / Ar-15 Bolt Carrier Group - Chrome
| Build | Parts | Total |
|---|---|---|
![]() | 33 | $2995.14 |
![]() | 26 | $1107.23 |
![]() | 19 | $4499.45 |
![]() | 20 | $1532.86 |
![]() | 10 | $958.96 |
1 global rating
this thing is a tank. mounting was straightforward and held zero through a long range day