Not good
I ordered 4 magazines. All have feeding issues. The feed lip's radius is incorrect. It's smaller than the 7.62 x 51 cartridge case. That causes a lot of drag. I unloaded all magazines and discarded them. I'll stick with SA or Checkmate when I can't get USGI.
Dont Buy
Of three magazines; one wont latch into the magazine well at all, another will latch if you literally beat it into a locked position, the third latches normally with more force than any other M-1A/M-14 magazine I have ever encountered. My recommendation is DO NOT BUY.
Junk Mags
Garbage mags that fail constantly. Dont rely on this for brand for any thing other than failing on you. YOU GET WHAT YOU PAY FOR. Try check-mate mags, theyre great.
Don't buy these
Bought 6. Of the 6, 4 would not fit properly and were unusable. I don't trust the other 2 and would not use them.
Would not properly seat. Returning.
I wished I noticed the earlier reviews and I would not have wasted my time purchasing these magazines. The magazine will not seat and lock securely to the rifle. I did not even get to fire a single round from the three I bought.
WORHTLESS!!!
I purchased 6 of these mag. I have had issues with everyone of them. Almost impossible to rock and lock any of the magazines into place. Bolt would bind up on magazine and not full close. I had to constantly hit the op rod to make sure the bolt was in battery. I had multiple failure to feeds. Sometimes two rounds would stripe off jamming the bolt and the magazine. I would tug on the mag to make sure them were locked not place only to slowly back out of the mad well. PURE JUNK!!!
Followers tip and jam on last round
In service rifle competition, you are required to load and fire one round at time. I purchased three pro mags for my M1A. All three of them have the same problem that on EVERY shot, with only one round in the magazine, the follower tilts up on its end and jams. This requires me to remove the mag, unjam the follower, and return the magazine before loading the next round. These are completely unusable.
Not GI specification
Years ago while at the range a man with an M1A/M14 was having trouble with these Pro Mag 20 rd mags. He had trouble when he put more than 18 rds in it, as the rifle would try to double feed with 19 or 20 rds. He also had problems getting the mag to lock into the mag well. I tried all his mags in my M1A and got the same problems. I have only GI, suck as CMI and Borg-Warner. CMI or Check Mate Industries is the only manufacturer of GI M14 mags and the only one who supplies the US government. CMI are absolutely reliable and made in the USA. In past decades many counterfeit mags have been manufactured by various foreign companies. Most of these end up at gun shows and online sellers.