GHK is another company that makes GBBRs.
Also 380 fps is good for field games but it is too high for indoor/cqb games.
Just remembered that the only thing I had to replace on WE (open bolt) M4 was the rail. It looked as if the rail was being held in place by the delta ring but the delta ring was to small so the rail would pop out of the delta ring and the bottom half with fall off. I bought a real steel rail, spend 5 minutes installing it and it is in there solid. Though my M4 is now front heavy.
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A Canadian is someone who knows how to make love in a canoe - Pierre Berton
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