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Posted: 1/13/2010 12:10:25 PM EDT
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YHM upper
YHM lower YHM barrel Bravo Co USA M16 bolt carrier group All new mags: 3 USGI and 1 Bushmaster Wolf and Golden Tiger ammo (crap I know but I was putting the money into parts) It won't feed. Fired about 50 rounds, never two in a row. The bolt either sails right over the top round in the mag or hits the back of the case and stops dead or catches the round and smashes the tip into the feed ramps and stops dead. Extraction was not 100%. Had a few failures to eject and a few (really) stuck cases. I can lock the bolt to the rear manually but, it didn't lock back once after the last round. I had to make one adjustment to the front site and was putting three rounds into a one inch square at 25 meters so the accuracy potential is there. Honestly, after a year of collecting parts, that's about the only thing that kept me from crying. HELP!!! Gimlet |
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Generally speaking, this is most often caused by a defective magazine (specifically a problem with the feed lips). You might also notice 2 dents in the casing that is still loaded in the magazine from bolt over-ride. The solution is to replace the magazine. USGI magazines are class 9 expendable and should be replaced when defective.might also check the magazine catch also to be sure it is in spec and function properly.sometimes the lips get stuck prior to seating fully at the top of it's height.just a thought
Edit in.using wolf or any poly coated ammo sometimes causes seating and extraction problems die to the poly coating.use a chamber brush once in awhile to help clean the chamber. |
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Did you assemble the lower yourself? If you did, check to see that you installed the magazine catch correctly. Also check your magazines to see if the followers bind and the rounds feed smoothly. Lastly, get better ammo to test with.
I start out with one or two rounds in the magazine, to see if the disconnector works and if the bolt catch works. |
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Quoted:
Generally speaking, this is most often caused by a defective magazine (specifically a problem with the feed lips). You might also notice 2 dents in the casing that is still loaded in the magazine from bolt over-ride. The solution is to replace the magazine. USGI magazines are class 9 expendable and should be replaced when defective.might also check the magazine catch also to be sure it is in spec and function properly.sometimes the lips get stuck prior to seating fully at the top of it's height.just a thought Good advice. Also, I'm sure you cleaned and lubed before shooting. I had the same type situation. I lubed my BCG wet, dripping wet. Continued to use and shot many rounds, probably 300 that day of wolf. I have since put around 2000 rounds of different ammo, including wolf with 0 types of malfunction since. Seems to be "broke in" now. Hope this helps.   " />
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This is a ground up build I did using all brand new parts. Manually operating the bolt, everything works as it should. Feeding, extracting, and locking back. It has a carbine stock from ACE Ltd, which I'm guessing has an "H" weight buffer. Wondering if a heavier buffer is in order?
From some of the responses here and over at The Firing Line I'm thinking the first (cheapest) fix would be actual quality ammo. If that doesn't work I thought I might try and borrow a buddy's Armalite and try switching bolts and mags back and forth to see if I can isolate the problem. Sound like a plan? Gimlet |
| I don't think u need a heavier buffer since it won't lock back right now as it is. Go get you some 5.56 rounds and run them through it to break it in. I had issues breaking in a rifle with wolf and it was just underpowered ammo. Also make sure everything is well lubed. Did you try all of the magazines or just one? |
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1. I had some mags that would not feed steel cases. Try a Pmag, they did just fine.
2. I also wonder if the M16 BCG could be too heavy for a virgin rifle. Especially if it is a middy it probably doesn't need the heavier BCG. Either way, hotter ammo is a good idea till its broke in and should get the BCG moving fast enough to cycle. Once the tolerances loosen up then try wolf again. 3. Is it tight even without any ammo feeding through it. I ran mine completely brake cleaned dry (problematically) for a hundred rounds to speed up the brake in. Then I lubed it copiously and it ran great. But that was such a snug bolt that it wouldn't cycle manually. I'd do this at a slow rate of fire. That can generate a lot of heat on the poor bolt. |
If you're not locking open, it sounds like your bolt is not going far enough back. If you don't get your bolt far enough back to clear the rear of the next shell, you're going to either ride over the top of it, stick, or push it forward from on top of the case and wedge it in the barrel extension area.
(either measure both or look for a circular powder residue on the barrel under the gas block. It should be centered on the hole) |
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IT'S ALIVE!
It was the ammo. I have been stock piling cheap ammo to put more money into parts. The only thing my local guy had in stock in 5.56/.223 was one lonely box of Sierra Match. That's box, not case. One. Being the big spender that I am, I bought him out. 
The Sierra functioned flawlessly. Feeding, extracting, & locking back were all positive and solid. When I intermixed Sierra and Wolf it ran like a champ on the Sierra and stopped dead in its tracks on the Wolf. This is an ideal opportunity to say "Thank You" to everyone on this forum and not just the guys who talked me off the ledge with this last problem. This is not my first rifle but, it is my first build and my first AR (not counting the M16 The Corps loaned me for a few years). I joined this forum 13 months ago and have been collecting parts for the last 12. I'm on here every day reading other peoples posts and asking questions of my own. I couldn't have done this without you guys. 
Gimlet |
| If it doesn't loosen up and shoot wolf, you may need to open the gas port up a hair. Wolf is slow and generally fairly crappy stuff but it should run in any AR (from Pmags). Also, ALWAYS clean the chamber every hundred rounds or so. Stuck cases are a bitch and dirty chambers plus steel cases makes broken extractors. |
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Quoted:
If it doesn't loosen up and shoot wolf, you may need to open the gas port up a hair. Wolf is slow and generally fairly crappy stuff but it should run in any AR (from Pmags). Also, ALWAYS clean the chamber every hundred rounds or so. Stuck cases are a bitch and dirty chambers plus steel cases makes broken extractors. thats right |
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Quoted:
IT'S ALIVE! It was the ammo. I have been stock piling cheap ammo to put more money into parts. The only thing my local guy had in stock in 5.56/.223 was one lonely box of Sierra Match. That's box, not case. One. Being the big spender that I am, I bought him out.
The Sierra functioned flawlessly. Feeding, extracting, & locking back were all positive and solid. When I intermixed Sierra and Wolf it ran like a champ on the Sierra and stopped dead in its tracks on the Wolf. This is an ideal opportunity to say "Thank You" to everyone on this forum and not just the guys who talked me off the ledge with this last problem. This is not my first rifle but, it is my first build and my first AR (not counting the M16 The Corps loaned me for a few years). I joined this forum 13 months ago and have been collecting parts for the last 12. I'm on here every day reading other peoples posts and asking questions of my own. I couldn't have done this without you guys.
Gimlet I'm happy to hear your problem is solved. This site is a wealth of information 
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Mine has gotten better with age, tho I only have had the package for a few months now.
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Find out if the buffer is a H-buffer or not. Buy a Carbine buffer spring from Brownells. Don't know if they make a higher rate spring for the ACE or not, but might be worth a shot to see if someone will let you borrow the spring along with the buffer. Swap a Semi-auto carrier for the full auto carrier. Run a better mag.
Try the hometown section an dsee if you can find someone local to swap the buffer and carrier to try out with the wolf. |
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