BCG not feeding all the way, advice please help

[Merc1138]

Okay so I went and to the range today and I used the original 10rd mags that came with the rifle and shoot over 120rd and everything worked like a charm. then I used a USGI 10/30 mag and it also worked great. And then I used the PMags with 8-10 rd in them and when you loaded the rifle the bolt wouldn't push the round in all the way in. But when I would try a PMag with 6-7 rd it worked.So it's something with these 10/30 PMags, when they are full they're not feeding right something is slowing the bolt down. What I want to do is fill them up with 10 rd and just leave them like that for a few weeks maybe its the spring that's to strong.

I'd be willing to bet money it's not the spring in your 10/30 pmags.

Load your 10 round magazine with 10 rounds and push down on the top round. It should give a little. Load your 10/30 and try the same. It's most likely the block inside is too long(or the rivet is too high) so the magazine can only hold exactly 10 with no room to allow the rifle to operate correctly.

Mark them and call them 9 round magazines.

[TheDigitalPicasso]

I'd be willing to bet money it's not the spring in your 10/30 pmags.

Load your 10 round magazine with 10 rounds and push down on the top round. It should give a little. Load your 10/30 and try the same. It's most likely the block inside is too long(or the rivet is too high) so the magazine can only hold exactly 10 with no room to allow the rifle to operate correctly.

Mark them and call them 9 round magazines.

Both Pmags that I have 10/30's and when loaded with 10 rd there is a little room when you push down but not as much on the regular USGi 10rd mags. Man this stupid 10 rd mag law sucks so much ***!

[contracosta]

Tighten your bullet button a little more.

[contracosta]

Tighten your bullet button a little more.

[Enfield47]

Okay so I went and to the range today and I used the original 10rd mags that came with the rifle and shoot over 120rd and everything worked like a charm. then I used a USGI 10/30 mag and it also worked great. And then I used the PMags with 8-10 rd in them and when you loaded the rifle the bolt wouldn't push the round in all the way in. But when I would try a PMag with 6-7 rd it worked.So it's something with these 10/30 PMags, when they are full they're not feeding right something is slowing the bolt down. What I want to do is fill them up with 10 rd and just leave them like that for a few weeks maybe its the spring that's to strong.

Now you know it isn't your rifle, it's the PMAG so you can at least go shooting using the metal mags. The next thing to try is using someone else's PMAG to see if the problem replicates - also have them try your PMAG in their rifle.

[TheExiled]

I had several pmags with me today but didn't get a text from you, figured you got it sorted out

[bill_k_lopez]

First thing I'd suggest is to not listen to anyone who says its this or that. There are PLENTY of things that can cause this, and like anything, you need to start trouble shooting.

Easiest thing to start with is the mags. Try a couple of pmags, and a couple of GI mags, some 9 round, some 20 some 30 (20 & 30's blocked at 10 of course).

Second thing I would check is swap out your BCG with a buddies that IS working - I had a rifle I purchased from a guy here who INSISTED the rifle worked fine for him, but from the very first time I shot it it wouldn't cycle, or eject properly - as it turns out the BCG he sold me was bent. As soon as I changed out the BCG things worked fine. Separate your upper and pull your BCG back by hand and let it fall into place - does it drop all the way into the upper? do you have to push it? If it falls without and problem then its fine - if it needs a little help, I'd look for whats keeping it from falling.

Check the gas tube, make sure its not bent and or rubbing against the BCG.

You could try changing the buffer spring, but I highly doubt this is the issue, as I've gone through this trouble shooting scenario many times, and buffer springs have NEVER been the issue.

Make sure the charging handle slides smoothly without the BCG in.

[Merc1138]

How the hell did someone manage to bend a bolt carrier, was he using it as a hammer?

[bubbapug1]

Trouble shooting list:

Insert mag with no bullets. Set bullet on top of follower and hit the bolt release.

Did it chamber? Yes....could be the mag....No, its an issue with the bolt and or buffer spring

Look at the mag. Does it show signs of heavy scraping from the bolt? If so does the mag itself slow down the mag progress? If it does you may need to trim down the mag lips slightly, not too much or you ruin the mags.

Does the bolt retract smoothly? A restricted buffer spring and buffer will give you a feeling if some restriction when you pull back the charging handle. The ONLY resistance yo should feel is the spring, not any binding. You will get binding in some buffer tubes which can be remidied by lubricating the inner part of the tube SLIGHLTY. I had this happen with a POF 308...it was maddening to figure out, but the fix worked. Eventually I put a new buffer tube on the gun as the original one just never got right totally.

If the Buffer retracts easily, and mag is not stopping the bolt, and the gun chambers one round easily, and up to six in a mag easily you could have a mag where the spring was left for 30 rounds and jammed into a 10 round space, making the tension too high to allow it to feed well at ten rounds. If thats the case, pull apart the mag and fix that issue.

Adn if all those don't work, check the ammo for proper case size...in fact I would do that first unless its factory ammo. All reloaded ammo can be sized too long, which keeps the gun from going into battery (fully closed bolt)

If you have any other questions PM me.

[myk]

I'd be willing to bet money it's not the spring in your 10/30 pmags.

Load your 10 round magazine with 10 rounds and push down on the top round. It should give a little. Load your 10/30 and try the same. It's most likely the block inside is too long(or the rivet is too high) so the magazine can only hold exactly 10 with no room to allow the rifle to operate correctly.

Mark them and call them 9 round magazines.

That's what I had to do with some of my aftermarket 'mags; I drove myself crazy trying to figure out why I had to slap the 'mag into place if the bolt was closed. Then, even if I could get the 'mag to lock I had trouble pulling the charging handle back. Factory 10 rounders had no issues. When I left the aftermarket 'mags at 9 rounds they worked fine....