Prometheus barrel

Pbcop547

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Hi guys. Can anyone tell me what is the difference between prometheus eg barrel for krytac and prometheus eg for m4a1? I own a g&g cm16 mod 0 with prowin hop up and flat hoped. Shooting at 408 fps with a guarder 6.02 stainless steel barrel. 

 
The Krytac one is specifically made for Krytac tolerances, hop unit and air nozzle etc. The generic one would probably suit yours better. 

 
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