Carbine from Polymer80 build? | Glock Talk
Mechtech responded to my question; whether their upper would work with a Polymer80 frame. I received a polite response in less than 24 hours. The substantive part is: "The Polymer80 will work on our CCU. However, there are a few small modifications that need to be made: 1. The steel Locking Block has to protrusions that stick out from the
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