Suppressors UMP help

[demo-dick]

I've got a UMP that shoots great unsuppressed, but when I throw on the AAC Evo-45, I'm shooting 6 inches low at 25 yards. I'm pretty sure this is not normal. WWB is type of ammo. Shift is repeatable, but 6 inches? My Evo-9 shift is only an inch. Cyclone has almost no shift. I had a reputable smith thread the barrel. The sound suppression is great, but the shift is killing me, especially with open sights. Anything I can do, any ideas?

 

[deadly0311]

Re: UMP help

As long as it is a repeatable shift then its completely normal. Just check to make sure you dont have any baffle strikes.

 

[fast freddy]

Re: UMP help

have you tried to clock the suppressor? take the mount apart and you can turn the piston. might find a sweet spot closer to the point of aim.

 

[demo-dick]

Re: UMP help

I actually hadn't thought about that since the fixed barrel spacer is in. Good idea, thank you for the suggestion.