AK feeding problem

[MrNiceGuy]

My new homebuilt from flat Romy has a feeding problem (see pic).
Basically the bottom of the bolt gets caught up on the top of the shell casing instead of pushing the shell casing into the barrel from the back.

Seems like it happens on all the mags I use.
The mags work just fine on my other NDS Romy.

To be more specific, it'll work fine when the mags are fully loaded, but start developing feed problems when it gets down to 3-4 bullets left.

Sometimes it will completely miss the bullet in the mag and just leave a slight scratch mark on the top of the shell case.

Case anyone shed some light on the cause and solution to this problem.
Thx!

https://

[valleyrat]

Your mag is not sitting high enough in the receiver. The top of the mag needs to be up against the lower rails. Its a good idea to check this before riveting the TG in place, sometimes its necessary to shave a little off the top of the selector stop so the mag sits higher. The bolt should grab a good 1/8th inch of the round.

[PolishMike]

yep, you might have to shave the selector stop a bit. Sounds like the problem I was having with my pistol build.

Also - your extractor looks a bit out of spec. I may be wrong but it looks a bit big to me, I also like to keep them rounded a bit more.

[MrNiceGuy]

Hmmm....guess I'm at the edge where the mag is "almost" fitting perfectly so it'll feed most of the bullets and only start having problem when the spring in the mag is not applying enough tension on the bullets, so that tiny difference in bullet position in the mag is making the mag fit problem come to light?

I'll give the selector stop thing a shot.
Worst case I can re-rivet a new selector stop if I screwed up.

I'll also take a look at the extractor.

Thx!

BTW....if you REALLY wanted to, and you're going to use the mags purely for this AK, can't you just file/trim the top of the back tab that's sticking out from the back of the magazines (instead of messing with the selector tab)?
Just curious, I'm not gonna do that to my mags.

[valleyrat]

Hmmm....guess I'm at the edge where the mag is "almost" fitting perfectly so it'll feed most of the bullets and only start having problem when the spring in the mag is not applying enough tension on the bullets, so that tiny difference in bullet position in the mag is making the mag fit problem come to light?

I'll also take a look at the extractor.

Thx!

BTW....if you REALLY wanted to, and you're going to use the mags purely for this AK, can't you just file/trim the top of the back tab that's sticking out from the back of the magazines (instead of messing with the selector tab)?
Just curious, I'm not gonna do that to my mags.

Yup, as the spring gets weaker the butt of the round can drop slightly. Best to have the correct amount of engagement. You can adjust the mags but better to adjust the gun so any mag will work.

I think you mean ejector, not extractor correct? I think the flats come with an ejector for 5.45 so you may want to check its protrusion. Dont recall the specs off hand.

[JHC]

Before you shave your selector stop check to see if the bottom of your receiver is perfectly flat, sometimes flat-builds have a little curvature to them under the selector stop which can keep the mag a few 1/16ths too low, easy to fix with a block of wood and a big hammer.

[vandal]

Check curvature, plus if your magazine guides are too tight they will actually squeeze the mag and prevent the follower from coming all the way up. May need to file them down a little. I know we all want mags that don't wiggle at all but that can cause problems.

[M. Sage]

Before you shave your selector stop check to see if the bottom of your receiver is perfectly flat, sometimes flat-builds have a little curvature to them under the selector stop which can keep the mag a few 1/16ths too low, easy to fix with a block of wood and a big hammer.

Tapco flat!

[weezil_boi]

+1 on the curvature of the bent flat. Mine had a bit of a banna shape ( ever so slight). A wood block and a mallet... fixed.

Is your bolt carrier/piston rubbing hard on the top as it goes forward into the gas tube? Mine was.

[FEDUPWBS]

[MrNiceGuy]

Hmmm....now that you guys mention it.....there is a slight bow on the receiver under the selector stop.

I just hammered it flat with a block of wood and I guess I'll find out how it goes this weekend.

Thx for the help folks!

[motorhead]

starting point for ejector is .560 from o/s of rec., dremel to that and fit with a file.

[RossRinSD]

haha, you must love watching they way we flounder around filing on God knows what bit of metal is sticking out, or watching us squish center support rivets in a press.

Well, whats your diagnosis?

I also noticed the round and the bolt are kicked off to the right side of the gun.

[weezil_boi]

haha, you must love watching they way we flounder around filing on God knows what bit of metal is sticking out, or watching us squish center support rivets in a press.

Well, whats your diagnosis?

I also noticed the round and the bolt are kicked off to the right side of the gun.

Yup, we learned that one the hard way too. no pressy pressy

[JeffM]

So did it work MrNiceGuy?