I had failures to feed, then I disassembled and noticed the receiver walls were gunked up and more importantly the feed ramp... Cleaned the hell out of it (everything) and oiled generously (these like to be shot wet). 100% afterwards. All my mags have a little play in them, they do move a little. Most people use them as a forearm, that might be why.
I sprayed that sh!t in there good. Think bolt/receiver walls need to be lubed generously. Had to clean feed ramp... caked on crap.
Thanks for the reply! I'll polish the feed ramp, and report back. By the way, for those of you that don't have a BRS-99- get one! 50+ guns, and my BRS-99 is quickly becoming a favorite, great little tank of a gun! I prefer the older one with the angled stock, as it points much more naturally, but the straight stock one rocks too!