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New A1 failure to feed

Posted: Sun Sep 06, 2020 9:56 pm
by SIMODshooter
I have four A1 14.5 uppers...

I zeroed the first one two weeks ago and had failure to feed on the left side feed ramp. It did the same thing as MAC/Tim had on his review. Pushed nose.of bullet in. I was using Troy Industries Battle mags.
And 55grain ball ammo.

Zeroing the other three next time out.

Curious if it is an issue with the poly mag.

Has anyone polished the feed ramps and cut them down slightly lower? It only happens on the left side feeding. I had four failures in 200rounds.

Other than the four gun one ran flawless. Strange to not have as much heat and gas from the chamber.

Thanks

Re: New A1 failure to feed

Posted: Mon Sep 07, 2020 2:04 pm
by apex
If it happens with a different mag it might be that the barrel extension was not timed correctly and the left feed ramp is off enough to cause an FTF.
What brand of ammo are you using?

Re: New A1 failure to feed

Posted: Mon Sep 07, 2020 10:10 pm
by Arkane
I have to ask - Tula ammo?

Re: New A1 failure to feed

Posted: Tue Sep 08, 2020 9:22 pm
by SIMODshooter
Federal white box 55grain... i did run a magazine of steel case with no issue.

Zero issues with the aluminum GI spec magazine I brought.

The tip was getting stuck literally right below the right side feed ramp. First time I cleared it and kept going. Second I actually looked at it close before clearing it. The last two same exact place.

Looked like if the feed ramp was tampered down slightly it would be fine.

Re: New A1 failure to feed

Posted: Thu Sep 10, 2020 8:18 pm
by apex
How large is the gap between the upper and the lower?
This is how a normal mag should sit- the tip of the dummy round is about 2mm higher than the bottom of the feed ramp.
IMG_0995.jpg
Outlined the tip of the dummy round for your convenience:
IMG_0996.jpg
This mag is a C-Product steel GI magazine.

Re: New A1 failure to feed

Posted: Sun Oct 04, 2020 9:36 am
by gg5k
i had this exact issue with a friend's 14.5 upper, was happening with my asc mags, never happened when using my lancers. would always be left side round regardless of m193 or reman stuff, a firm tap to the bottom of the mag would cause the round to jump up and feed, did have a couple where the round did get set back into the casing though, figured it's just a magazine issue, though interesting seeing this very exact hiccup described by someone else.