I have had a 4516-1 as my EDC for close to 4 years now. Got it LNIB and have had only one small issue. When I first fired it it wouldn't extract the spent case every time. I took off the extractor claw and lightly dressed the surface with a India stone. I have had no issues since.

In regards to mags I have used all the different colored follower mags with ZERO issues. The yellow, black and orange follower mags all work.