Next Level Armament AR10 Firing Retaining Pin Black. During the testing phases on our 308 BCG we tried several variations of retaining pins. All of them were very weak solutions for the application and they often broke after extended use. Specifications for Next Level Armament AR10 Firing Retaining Pin Quantity 1: Manufacturer: Next Level Armament Color: Black Gun Make: AR Platform Gun Model: AR-10 Gun Type: Rifle Package Contents: Next Level Armament AR10 Firing Retaining Pin Quantity 1 What firearm models does the manufacturer say Next Level Armament AR10 Firing Retaining Pin Quantity 1 is compatible with? The manufacturer suggests that Next Level Armament AR10 Firing Retaining Pin Quantity 1 is compatible with AR-10Next Level Armament NLX256: AR10 Firing Retaining Pin Black