They came in today.
And the short version for the tldr crowd is if you have a good supply of real mags don't bother. If you only have a few and don't want to put wear and tear on $100+ replacement mags maybe grab a few for range use only.
I'll put up some pics later I have a bunch of things going on today.
I will state right of the bat they are much thicker than the real mags, and you also have to actually slam the magazine in to the rifle to seat it.
I may do a bit of file work on the lug, but I want to do some measuring first.
I didn't get any double feeds , but I did get a few fail to feed with the casing sticking up just right on the feed lip. I think the rear lug geometry is off just a touch to my rifle. For the record this rifle has never failed to feed before for me, so it is definitely the magazine that is the issue.
I only put 50 rounds thru the one magazine and still have the other new in the baggy so I could compare any wear between the two.
So to sum up as a range mag if you only have one or two mags you might want a few.
If you got a psl in the hay day and socked away a few dozen loaded 4 cell pouches , don't waste your time or effort with these.