I usually get the 3rd gen Pmags with windows, for my SCAR. They cost a little more than $9 each.I got mine on sale at Ft. Worth Gun when i was working in Dallas a couple of years ago.
They had a 10mag limit - I had to go several times.
on a related 1911 note,
I was thinking about getting NS on my Springfield 1911a1 and I am wondering if it would be better to get the front of the slide dovetailed or fit and stake a front night sight?
I have read that the Springfield's are a non-standard size.
I had a Springfield Mil Spec (stainless) in the 1990s. 1st 1911 I owned.
I had a local smith order the night sights aned put them on - but I stayed with the non dovetailed front sight. They do make them for that Gi and Milspec slide. I don't know which ones to order personally, though. I used to - but I haven't owned a Springer in many years.
The trijicon rear sight that goes on it looks almost like a Beretta night sight. But, it's cheaper than getting the slide cut for the Novak dovetails.