The carbine gas system solution is to use the late style carbine extractor spring. The interim fix was to slip a rubber o-ring in with the spring; you'll see that on some Colt's and some govt AR's. The high port pressure caused the gas to hit the expansion chamber in the bolt with such force that the extractor actually bounced before it began its travel rearward.
There's no doubt that the extractor tension needs to be correct, whatever method you choose, but the best solution is an adjustable gas block. End of problem with over-gassing.
MM
