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Ordered an Aero Precision Grendel upper...
#13
I'm not 100% sure but I think the Toolcraft bcg also uses the shorter firing pin. I bought the 5.56 Toolcraft BCG and used a GB bolt.
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Ordered an Aero Precision Grendel upper... - by Jakegsxr11 - 01-27-2018, 12:58 AM

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