[Cavier Gun Guy]

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?

 

[reallyoldguy]

30 rounds? If so try 28-29.

 

[StarWolf]

Last round left in mag shouldn't be a factor of how many rounds were in the mag initially.

 

[HibikiR]

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