Mags that will reliably feed M855A1

**1168** · 10-13-20, 15:18

Originally Posted by ABNAK

IIRC didn't later lots of A1 get throttled back a tad to reduce some of the pressure?

seems to have been. Unfortunately the barrels I chronoed the older lots through are different from the barrels I chronoed the newer lots from. Also, different chronos. But the recoil seemed higher with the older stuff, too.

**17K** · 10-15-20, 08:33

RevM/MOE Pmags feed it just fine. Feed geometry is the same as the GenM3.

**lysander** · 10-15-20, 15:16

Originally Posted by ABNAK

Reliably meaning without damage to the barrel extension. So far I have these:

EPM mags (FDE with blue followers)

Magpul Gen 3

Okay SureFeed E2

Any I'm missing?

EPMs were specifically designed to feed M855A1 in the M4. There were changes to the feed lips to change the presented angle.

The USMC has adopted PMAGs as they feel these work well with the M855A1 and the M27.

**JLP** · 10-15-20, 17:23

Totally learned something new today and also paniced a bit as I have a CRAP TON of the original 855 and have yet to shoot any of it.

**1168** · 10-15-20, 18:47

Originally Posted by JLP

Totally learned something new today and also paniced a bit as I have a CRAP TON of the original 855 and have yet to shoot any of it.

Its fine.

**JLP** · 10-15-20, 19:17

Originally Posted by 1168

Its fine.

Yep that's one of the things I learned today! It was just a little bit of google-fu to get me off the ledge and I also learned why so much of it was so cheap back in the day when the Army was dumping it. Glad I bought it when I did!!

**Wake27** · 10-15-20, 19:30

Originally Posted by lysander

EPMs were specifically designed to feed M855A1 in the M4. There were changes to the feed lips to change the presented angle.

The USMC has adopted PMAGs as they feel these work well with the M855A1 and the M27.

And the failure rate when using them was higher than with Magpul M3s.