Rem. R1 Enhanced slide not locking after last round
I did correct break-in with several hundred rounds with no problem. Took off wood grips and installed Hogue Rubber grips, no problem. Grip still to small for hands so found arched housing and installed it. That's when on the last round the slide does not come all the way back and locks open for next mag.
changed the arched back to factory housing and problem still occurs. It still fires every round but hangs up only after the last round fires and it ejects. The slide stops about 1/2 inch before it locks up and the mag is stuck as well. I can't believe changing the housing has any effect on the slide operation. All five mags do it and yes they are all factory Remington mags. suggestions?
Thanks in advance!