AR Sponsor
Posted: 7/1/2014 3:43:28 PM EDT
| I recently picked up a new Bushmaster HBAR upper in trade. I have tried it on 4 different lowers. 2 DPMS, 1 spikes, and 1 new frontier. It pinned on all correctly but the bolt wouldn't retract. Tried it on a buddies bushmaster lower and it worked. Is this a common issue? |
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