This is a discussion on Thermold Mags? within the Ammunition forums, part of the M14 M1A Forum category; Just recently I ordered some Thermold mags from Sportsmans Guide because they were not taking back orders on the metal ones. Got them in today ...
Just recently I ordered some Thermold mags from Sportsmans Guide because they were not taking back orders on the metal ones. Got them in today and they will not feed properly. They snap into the magwell fine but will not feed. I also looked today and now everything is back ordered and they won't take any more orders.
Here is my question: Due to the lack of stock from suppliers should I A) send them back and wait two months for replacements? B) Send them and wait three months for metal mags? Or C) try to trim up the lips on them and make them work?
I tried what you suggested on one of them and one of the tabs on it broke but I taped it back up and loaded it and now it will feed half of them but after 8 rds the other 12 won't feed. Any other suggestions? Did you have to trim or alter the feed lips in any way?
I just got some, and they refuse to feed the last 3-5 rounds. I took one apart last night and found that I have the "old" 8 coil springs. New are 9 coil. I tuned up the follower by removing flashing. Ornate a distinct improvement at the kitchen table, er, workbench... I'll function test it when I get the stones to brave this cold snap!
One thing I noticed on the problem with the last few rounds feeding, is that the rear of the mag lips where the base of the casing sits is rounded a little. This is mainly from the molding process. Also, there tends to be excess plastic on the edges from molding as well.
I actually trimmed the excess plastic off the edges to clean it up, and squared of the inside of the rear of the lip a little, so the casing sits flush inside the rear of the lipo. I did so with my X-acto, in a very small manner. Very little was trimmed, if any. All my Thermolds now cycle ammo just fine.
I took one of mine apart, and did as Condor did. I also tuned up the follower a bunch ie; filed the flash off, and a little more. The follower was dragging a little at the rear. Works fine now. I'll give the others the same treatment and see what happens.
I have about a dozen of these and after trimming any excess from when it was molded, stretching the springs a little, and spraying the inside and follower with silicone spray they all work fine. I did all this before use so I have no idea if there would have been problems with them as is. They have been very good mags for me.