After purchasing slide fire stock I figured I would need lots of ammo to accommodate my new AR's rate of fire. I found some federal green tip 62gr at a good bulk price. I'm now told that I should have a 1in 12? (I think that was the rate) and that my Olimpic arms PRC 1 carbine probably has a 1in 9 and is suited for the lighter 55gr bullet. Also I looked on my barrel and found no markings indicating rate of twist. Please enlighten me. The only mark on barrel is 5.56.
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