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Discussion Starter · #1 ·
Anyone running their HKmr556 suppressed ever have had their bolt lock back with one round left in the magazine. I am running BCM metal mags and consistently am having the bolt lock back with one in the mag. This has only happened when running suppressed so I am thinking it has to do with being really over gassed. Called HK and they were not helpful. Any ideas?
 

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Start with simple tests before getting invasive. After trying reallyoldguy's test, switch to different mags like PMAGs and see what happens.
 
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