That was a common problem when the M-16 was introduced. The solution was to load 19 rounds in the 20 round magazine. This was before the forward assist was introduced.
The early gas trap M-1s did not have a place for the cleaning kit in the butt and no access door on the butt plate. Does your butt plate have the door?
forward observer is correct. The military used 70 grains of black powder for rifles and 55 grains was the standard load for carbines. You can shoot the 70 grain loads in your carbine but it will be a little uncomfortable.
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