Pretty good.
But, one thing: The current USGI aluminum M16 mag is a certified POS, and shitty mags have always been the singularly biggest weak link in the system.
Time to penny-up and get somethig that works, like the MagPul P-Mag. I have 20 and they work better than any of my 60+ USGI mags.
Well, after 23+ year of Infantry and Engr service, I had a few mags that accidently got “crushed” to get them out of circulation, but most were tested with a few mags full before my comrades and I kept them in our personal kit.
I can honestly say that the vast majority worked, and when kept in personal equipment, worked for a long time!
Buying surplus or gunshow stuff usually is a waste of time and effort/$. (Think of how they got to teh show-discarded by the Army and sold as salvage mostly!)
God Bless.