rsideout
UZI Talk Life Member

I picked up a registered sear in a burst pack. The host is an MP5K. Selector switch moved very easy to the 4 positions. When I took it out of the lower to put in a full sized 9mm lower, the selector was very hard to move in the new lower. Easy to move outside of the lower. Same thing when I initially put it back in the K lower. And the compression spring rod properly sitting on the stop. Looking for advise from the UziTalk brain trust. Am I just putting the ambi selector levers back together too tight?