I picked up a few 10rd sig made in USA all metal mags used, any input on these? Are they just as reliable as the mecgar 10 rd 1/2 metal 1/2 plastic mags? Thanks for any info.

Checkmate is the mfg, they make good quality mags.

Early checkmates has some issues. But assuming they are recent gtg

Thanks y’all!

If they are the old ban era “USA” brand magazines they are garbage. Back in the early to mid 90’s a brand called USA capitalized on the scarcity of magazines and put out some of the worst quality magazines in history!
I may be wrong but suspect that the newer company pro mag may be the same company reconstituted- horrible quality.
Having said that every once in a while you might get one that actually works.
I would not buy anything but oem or mecgar myself

My P226 Legion and my Mk 25 both came with Checkmate USA made, Sig branded magazines. No issues at all, they work just as well as my German and Italian made magazines and they seem a bit studier. I like the painted finish on them as it helps prevent rusting in the wet weather we have 8 months out of the year where I live.

My experience with USA Brand mags has been shitty. Those may be ok, I don't know.