Does this upper use the large pins (0.25") or small pins (0.155") to attach to the lower. I have a Rock river lower, and it uses the 0.25" pins. thanks

Question

James G. · Answer

Eddie, this should be the small pins as is on your Rock River. However, I would confirm this with Bushmaster Customer Service to be absolutely sure at Phone: 1-800-883-6229 or by online inquiry at :  https://www.bushmaster.com/contact

Rick C. · Answer

Eddie - this upper uses the 'standard' pin size (.155 inch") and will fit pretty much any standard AR-15 lower.

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Does this upper use the large pins (0.25") or small pins (0.155") to attach to the lower. I have a Rock river lower, and it uses the 0.25" pins. thanks