M1 Carbine Mags

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Apr 1, 2015
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So I have an M1 Carbine and am havbing magazine seating issues. The mag it came with is marked “AT” on the back and it seats just fine as does the pre ban 30 rounder. However, 2 other 15 round mags I have are not seating properly and require a very hard and deliberate palm smack on the bottom to get them locked in. They either sit in snug but without fully actuating the mag catch or just slide right out.

Question 1: Any one know why this is happening? I check the front and back mag catch ridges on the mags and filed them down a bit to see if they were minorly out of spec but that didnt help

Question number 2: anyone know who makes the ones marked “AT” on the back so I can search for some of those?

Thanks in advance!
 
AT is more likely AI or Inland. Thats probably why it works.
Take a hard look at body dimensions in the ones that dont fit.
Theres a shit ton of poorly made mags out there. Good thing is thered still millions of good mags out there also. Toss the problem ones in the junk draw
 
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