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651 Posts
Last time at the range the UMP started "acting up". It was awfully dirty, so that may have been the issue. I've not had it back at the range since a good deep cleaning to retest it.
Here's the problem......
While in 2 shot burst mode doing 2 chest, 2 head drills it was actually running 3 shot burst sometimes. I'd squeeze the tigger once and after the second shot I was transitioning to the head shot and a third round would fire usually hitting low to mid neck.
Also while in SA only I was getting an occasionaly 2 round burst.
Could this be due to being dirty, or is it more likely a real internal problem?
Here's the problem......
While in 2 shot burst mode doing 2 chest, 2 head drills it was actually running 3 shot burst sometimes. I'd squeeze the tigger once and after the second shot I was transitioning to the head shot and a third round would fire usually hitting low to mid neck.
Also while in SA only I was getting an occasionaly 2 round burst.
Could this be due to being dirty, or is it more likely a real internal problem?
