Since an HK416 upper is nearly impossible to get not to mention a few grand, I was wondering if anyone has any experience/thoughts on the gas piston kits on the market.
I know CMMG makes one that looks promising. I know Addax Tactical has a purpose built gas piston upper they now sell for $1K, but that's more than I was hoping to spend.
I know CMMG makes one that looks promising. I know Addax Tactical has a purpose built gas piston upper they now sell for $1K, but that's more than I was hoping to spend.


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