M&P 9c, feed issue's

[gpm]

I'm getting a lot of feed issues with my M&P 9c,
Liberty booster, monocore design ( similar to a Mystic X )
115 gr fmj remington ammo

- stove pipe jams,
- does not lock slide on last round

any idea's ?

Liberty has not replied to my email !

[Zombie1969]

Two things come to mind. Either your limp wristing or your supressor is to heavy.

[gpm]

I've had other people shoot it with same results. It is 7.9 oz. well within the
range of a pistol suppressor. It sounds great, just not reliable cycle.
works good on a ar9 platform with same ammo.

[propeine]

I've had other people shoot it with same results. It is 7.9 oz. well within the
range of a pistol suppressor. It sounds great, just not reliable cycle.
works good on a ar9 platform with same ammo.

Blowback vs short recoil is a poor comparison. First I would say lube the booster then if that doesn't work I would say try a lighter booster spring? McMaster or MSCDirect should be able to help you out for very reasonable prices. 7.9oz is quite light for it to not function though.

[Fulmen]

Ultra-compacts can be a challenge. The increase in mass has a much greater impact due to the short barrel and low mass, in addition the barrel tilt is more severe, and this movement is not compensated like the rearwards motion.