How do you upgrade a Gas CM16

yeh i have its not exactly hard after all i am changing the outer barrel aswell

 
if it runs on gas and has blowback it is a gbbr, not sure why folk think differently, the end result is just achieved a different way to convention is all.

My GHK G5 runs AEG barrels and hop bucking too, is still a gbbr, it is just easier to mod then others that don't!

 
Right so it classifies as a GBBR because of what it does but people don't see it as a real GBBR because it's achieved a different way that makes sense lol,

 
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