I'd like to bump this thread and ask for any additional thoughts on the differences in terms of recoil and also in terms of reliability between the M1/M2 and the M4 models. Thanks.Have both. Greatly prefer the M1S90 for handling characteristics and speed from muzzle down up to target. Cycling, for me is faster on follow up shots as well.
Design of M1 series feels far more rugged as well.