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Discussion Starter #1
Hello all...I am kind of dismayed and all. I have a UMP and two 45 cal cans for it...After zeroing the HK if I am not within 10 yards of the target silhouette the bullets completely miss the target...at 10 yards they are about 10 inches off at 2 Oclock...again, at 25 they I completely miss the man silhouette target ...The cans are two diffrent models, one can be shorten and used in that configuration. As far as I can tell there are no baffle strike. Any ideas, because I am fresh out here! Thanks in advance...
 

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i’m going to assume you do not have the flange barrel. If it has been a threaded barrel, I would check to make sure the threads are concentric. Also, make sure you’re running a fixed spacer and not a regular booster on your suppressors. I have never had a problem with getting on target on my USCs that I had cut and threaded.
 

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What suppressors are they and what type of attachment are you using?
 

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Pretty common with the UMP. IMO and experience, it is a HK that doesn't like to be suppressed. Too much POI shift for a barrel that is held in a polymer receiver with 1 pin.
 

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Discussion Starter #5
i’m going to assume you do not have the flange barrel. If it has been a threaded barrel, I would check to make sure the threads are concentric. Also, make sure you’re running a fixed spacer and not a regular booster on your suppressors. I have never had a problem with getting on target on my USCs that I had cut and threaded.
Sorry for late reply...I am overseas right now...I do have a threaded barrel on the UMP...I have not check for concentric thread/barrel and I do run the booster on it.
 

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Discussion Starter #7 (Edited)
Pretty common with the UMP. IMO and experience, it is a HK that doesn't like to be suppressed. Too much POI shift for a barrel that is held in a polymer receiver with 1 pin.
Its a shame I spent so much money and time and Stamp, if i cant correct this issue here...
 

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As mentioned above, you need a fixed barrel spacer to use those cans with the UMP. POI shift with my 3 lug and Hybrid can is less than one inch.
 

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Discussion Starter #9
As mentioned above, you need a fixed barrel spacer to use those cans with the UMP. POI shift with my 3 lug and Hybrid can is less than one inch.
Thanks for the info...I am overseas right now and will give it a try when I get back...cant wait...thanks...
 

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Discussion Starter #11
Because I am not familiar for the reason of the booster...I have a feeling your going to tell me...
 

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Because I am not familiar for the reason of the booster...I have a feeling your going to tell me...
Pistons/boosters should never be used on a fixed barrel. They are only for firearms where the barrel has to move to unlock, such as pistols with a titling barrel. You can use the piston itself but you just have to replace the spring with a fixed barrel spacer.
 
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