optimator Posted January 26, 2019 Share Posted January 26, 2019 I've been using a Hahn block with a FM colt bolt and FM barrel on a standard AR upper. No issues, but I think I want to build a dedicated 9mm lower. I'm looking at the CMMG Colt lower. Is anyone else using this combo? Link to comment
BartCarter Posted January 28, 2019 Share Posted January 28, 2019 I have used both CMMG and Spikes Tactical lowers. Both work well. The Spikes is more complete. Link to comment
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