Multi Role profile threaded barrel. 4140 chrome moly construction with sale bath nitride finish inside and out. 1/2-28 threads. 1:7" twist. Carbine length gas port. and .750" gas journal. Chambered for 5.56mm NATO.
- Caliber : 5.56mm NATO
- Length : 12.5
- Finish : Salt Bath Nitride
- Item Description : CMM MK4 MR 4140CM 5.56 12.5
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