I am not 100% sure on if it will release on a loaded mag. I was shooting and had the muzzle upward, BHO open after the mag was exhausted and brought the gun down on the shooting bench butt first and it released because I dropped it about and inch off the bench. Then I tried again but used my hand to strike the buttpad with an empty mag and with no mag. I didn't think to insert a loaded mag because I really did not want the bolt engaging without releasing the BHO on a loaded mag, so I suppose I should try that but I thought that the BHO would not disengage unless released @ the lever.
It should not be releasing with an empty mag inserted. If there is a loaded mag or no mag, it will release if bumped. My suggestion is do not try it with a loaded mag. Accidents happen and I definitely don't want to hear that you had an accident as I'm sure you don't either. Maybe with a few dummy rounds would be ok.
Thats totally normal then.My uncle told me that when he was in Korea (for the hot war) a lot of the guys used to reload their carbines like that. I can't image it was something one would do in combat but it does add a certain amount of flair to a load doing it administratively. Personally I don't use the BHO on the USC. I think that the manual of arms should be consistant between it and the MP5 so I try to never mess with it.
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