AR15.Com Archives
 Feeding Problems
00Bravo  [Member]
3/19/2003 12:07:43 AM
I am having problems feeding rounds in my AR-15. It will feed fine for about 20 rounds and then it will catch on the chamber and cause a stoppage.

I am using the winchester USA 5.56mm ball ammunition.

I have checked my gas key on my bolt carrier and is tightly secured and staked. I have brand new magazines and bolt closes forward into the chamber properly.

What advice can you give me. I am out of ideas, could you please help me with this problem and give me some ideas on this issue.

Thanks,
Larry P.
Dano523  [Team Member]
3/19/2003 2:26:50 AM
Welcome to Ar-15.com. In your statement of the "it will catch on the chamber", do you mean that the bullet tip will stick just below the feed ramp, or the bullet tip starts to go into the chamber, with the bolt coming to rest on top of the round. These are two different problems and the solutions are not the same. Give us a little more detail on the jam so we can figure out what is happening. Dano
00Bravo  [Member]
3/19/2003 10:11:20 PM
The bolt will operate by pushing the round from the magazine and then wedge itself on the ramp, where the breach is, preventing the round from going into the chamber. I hope this helps. Thanks, Larry
Dano523  [Team Member]
3/20/2003 12:07:16 AM
1. Does the bullet tip strike the upper receiver below the feed ramps with the bolt stuck behind the round? 2. Does the bullet tip strike the upper receiver below the feed ramps with the bolt stuck on top of the round? 3. Does the bullet start to feed into the chamber, then the bolt stops behind the round, with appears to be the lack of pressure/force to drive the round completely out of the mag and into the chamber?
naloxone  [Member]
3/20/2003 9:37:47 AM
#4: When chambering a round, does the round stop ON (not under) the feed ramp? If anyone can clue me in on this one, i'd appreciate it. :D
Dano523  [Team Member]
3/20/2003 1:51:34 PM
Naloxone, If you riding the charging handle back down as you cock the weapon, that would be your problem If the rifle does this during a self-loading cycle, then you have binding. Chances are that either the hook on you hammer is too long and the hammer is binding up in between the carrier/disconnector. Look for a line behind the hook on the disconnector, Or, your hammer top edge is a little too high and is binding up on the firing pin. Cock the rifle and slowly ride the cocking handle forward, you should be able to feel the binding. Or as simple as having a Car spring installed in a Full size tube.
naloxone  [Member]
3/21/2003 2:47:04 AM
[quote]Originally Posted By Dano523: Or, your hammer top edge is a little too high and is binding up on the firing pin. Cock the rifle and slowly ride the cocking handle forward, you should be able to feel the binding. [/quote] The edge of the hammer is definitely dragging on the carrier (or vice versa). There's some wear there and there's some grind as the carrier goes over the hammer. Just shoot it out or do i need to learn how to grind the hammer down? :D
Dano523  [Team Member]
3/21/2003 3:17:43 AM
You don't need to learn a thing. If the carrier is binding up on the hammer as it passes over, then remove .040 from the tail (part that contacts behind the disconnector hook). If the firing pin is binding up on the hammer, then roll file the top edge of the hammer (top of firing pin contact pad). You may have a modified M-16 hammer (auto sear tab ground off) without the L cut. You don't need to make the L cut, just file/lower the top edge where the L cut would be located. Here is a site for a comparison of the different types of hammer (early verses STD). [url]http://www.biggerhammer.net/ar15/hammers/[/url] P.S. If you just do both, it will not hurt a thing.
00Bravo  [Member]
3/21/2003 7:32:39 AM
This is what happens,yes!!! The bullet tip strikes the upper receiver below the feed ramps with the bolt stuck behind the round. Hopefully this helps. Thanks, Larry
Dano523  [Team Member]
3/21/2003 2:43:22 PM
If your getting bullet tip strikes below the feed ramp, 1.Make use that you are using USGI mags that are still in good shape. On some after market mags, they just don't feed right. 2. Tighten the mag catch up one more turn. Push the mag release button with a pencil, then reach over to the over side and turn the catch one-turn clockwise. This will hold the mag tighter in the well and keep it from slipping down and feeding low.
00Bravo  [Member]
3/21/2003 10:12:56 PM
Yes, that worked!!! I really appreciate the advice and expertise given.I was going ballistic over this problem and the adjustment made a tremendous difference. Again, thanks for your help. Stay safe, Larry P.
naloxone  [Member]
3/22/2003 9:04:43 AM
Dano, Well, you fixed my first problem. Thanks! Fed nearly a whole magazine just fine now. But the second to last round got jammed underneath the bolt. (This is just manually cocking and releasing the bolt, btw) So what would be the cause/fix for scenario #2 as above?
Dano523  [Team Member]
3/22/2003 11:01:46 AM
Naloxone, Live fire for effect, the rifle will act differently than when you hand feed. Then if it seems that it is still feeding below the feed ramps, tighten the mag catch one more turn. Push in on the mag catch button with a pencil, and then reach over and tighten the catch one more turn clock-wise. This will cause the catch to hold the mag a little tighter and keep the mag from drooping in the mag well.