GT. You will probably want to do some investigating of some modified recoil springs, since the heavier the barrel, a lighter recoil spring will be required for full recoil of the toggle assy. in the case of the GPC 16+ inch "carbine" barrel, a one piece recoil spring with about 14 turns will allow full recoil, but doesn't have enough strength to return the toggle and load the next round. Perhaps a dual spring system, as in the Radom, Glocks, etc may be the answer. TH
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