Magpul Mags on my Norc M4

I believe Blaxsun also "fits" the mags and probably has the process down pretty good.
I truly believe a solid cleaning will solve your problems :) ...don't be afraid to run it wet either.
 
Is the BCG damp with lube? many, many AR issues (such as short stroking, failure to hold open, failure to feed, etc) can be caused by running the rifle too dry. If what you are describing happened to me, the first thing I would do is spray the BCG down with lube through the E-port. I run PMags with no issues in my Norc.

PS: Do Not Lube The Buffer or Recoil Spring
 
enefgee said:
Is the BCG damp with lube? many, many AR issues (such as short stroking, failure to hold open, failure to feed, etc) can be caused by running the rifle too dry. If what you are describing happened to me, the first thing I would do is spray the BCG down with lube through the E-port. I run PMags with no issues in my Norc.

PS: Do Not Lube The Buffer or Recoil Spring
Click to expand...

Thank's for the suggestion... i'll give it a try tonight.

SM
 
OK came back from the range 1 hour ago and still have the same problem. When I fire the last round with the P-Mags the bolt cycle just like if there was another round left in the magasine. So I tried to putt in an empty P-mags and the bolt stays open just like it is suppose to do. I cant figure out what the problem is, the original mags works great and the P-Mags works fine too exept for this little problem. I'll take some pics of my lower with the Mags inside tonight, maybe someone will see something that i dont.

SM
 
Pics

Pics of the original Norc Mag beside the P-Mag
0904002200.jpg

0904002201.jpg

Now pics of my lower with the P-Mag inside.
0904002207.jpg

0904002206a.jpg

Pic of my lower with the original Norc Mag in it.
0904002205.jpg


So my question is this... It looks like the follower on the P-Mags are not going all the way to the top of the magasine. There is still a gap of 3/8" so do you think that this could be the problem or is it all the P-Mags that are made that way?

Tx
SM
 
Last thing to try... buy a box of different ammunition than what you are using. Try something in 62gr. Load 2 cartridges in the magazine and fire them off, see if it works or doesn't work. Good luck.
 
It's one of several things and perhaps a combination of issues:

  • It's possible it's short stroking but I doubt it. This would explain why it locks back when you manually cycle the action, but again... I doubt this is the reason.
  • It's possible that the magazine spring isn't strong enough to push up on the bolt catch, but, once again, I doubt it. The only way I could see this being the case is if either the mags are poorly pinned and are catching internally or if the bolt catch is highly resistive to movement due to being out-of-spec/dirty/burred etc. I've seen Blaxsun's mags and they're excellent. If the bolt catch itself is resisting movement, this would explain the issue. The mag follower is trying to push up on the bolt catch but it is only moving part way.
  • The upper and the lower have too much play between them. The bolt catch is in its fully up position but because of the loose tolerances, the bolt is glancing over the catch. But why does it lock back when you cycle the action manually you ask? Read on...
My guess is it's either one or some of these issues. The reason it locks back when manually cycled is probably a combination of the bolt not moving at a high speed and allowing the bolt catch to fully extend upward before the bolt locks in on the forward motion and the fact that when you manipulate the charging handle you're pulling the upper into the lower and closing the gap on the tolerances. Trust me, it doesn't need much play for the bolt to glance over the bolt catch when the bolt is moving with incredible force after a shot being fired plus all the extra vibration after a shot etc.

Other points:
  • A good cleaning can't hurt regardless.
  • The pics of your PMAGs look completely normal. All mine look identical. The followers are in their fully elevated positions in your pics.
  • I doubt the ammo has anything to do with it.
Out of interest, if you have a set of calipers, take the lower and measure the height of the bolt catch in its normal resting position and then measure it with an empty mag pressing up on it. Make sure that the catch is fully elevated with the empty mag in the magwell. There shouldn't be any further upward movement of the bolt catch possible with an empty mag in the magwell.

.
 
Hi,
I went to the range last evening with Winchester ammo 45gr. Jamms galore! I used some American Eagle tactical 55gr. No problem. The problems I had with Winchester happen over and over again.

SpoonMan said:
I try that and it worked out fine. The bolt stays OPEN with the P-mags just like it does with the original mags. I use Winchester ammo and i'll try a different kind of ammo next weekend. I did clean the upper and lower this morning like someone else as suggested.

Will keep you posted on next weekend try out.

Thank's
SM
Click to expand...
 
Heavier bullets have more "ooomph" to work the action which is why I suggested using 62gr ammo to see if the problem remains.
 
You must log in or register to reply here.
Back
Top Bottom