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Posted: 11/19/2007 8:29:04 AM EDT
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So I had my first range session with my new AR and I was a bit disappointed. It's my first AR, but I had someone there with me that has quite a bit of experience with them. I experienced two major malfunctions. They both occured after I inserted the magazine and pulled the charging handle back to insert a new cartridge. Both times I thought all was good, but I went to pull the trigger and nothing happen. I went to put it on safe and couldn't. I went to cycle the charging handle and couldn't - it was frozen forward. We had to use something to kind of pry the bolt back. This happened twice. We think that I was kinda riding the charging handle forward instead of letting it fly forward, but I'm surprised that that could cause such a serious malfunction. While I recognize that there may have been some operator error on my part, I'm also wondering what else could have caused this, and/or if this is common? If the problem was entirely operator error, I'm a little surprised that it is this finicky. Again - the bolt would not move at all - had to take it apart and use something to pry the bolt back both times. Please help. Anyway - looking for some feedback. I'm seriously doubting my new purchase at this point however... hinking.gif |
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use more CLP on the bolt lugs... also lube the cam pin area... had this happen on a new bolt carrier group which i started shooting relatively dry... gave the lugs a good coating of CLP, and ran 100+ rounds through it with no problem... disassembled the bolt carrier group, wiped off the excess CLP and fired another 100+ rounds... in my case the bolt would close enough to allow the hammer to drop, but it wasn't in far enough to strike the primer (thankfully) |
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ccondrey, A little more information is going to be needed for the collective to help figure this out. 1. What make and model of AR do you have? 2. What type of magazine were you using? (USGI or other brand) 3. What type of ammunition were you using? (commercial or reloaded) With this information we should be able to come up with some probable causes and some solutions. Sarge |
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Sorry for the newb question, but what are the bolt lugs and cam pin area. I know I can pull out the manual when I get home, but any link to a good pictorial reference to the guts of an AR would be much appreciated. It's a new rifle. CMMG M4. With new FMJ 55gr brass cased ammo (not sure of brand). Happened once with the factory GI mags that came with the rifle and once with a Mag Pull mag. I cleaned it up and lubed it pretty good before going, but when we got there the guy I was with suggested that it had too much lube on it and we wiped down the bolt(?) before we shot it any. |
my problem was with a CMT bolt being really tight in the barrel extension, i believe CMMG uses CMT bolts... the cam pin is that little rectangular pin that is on top of the bolt carrier under the gas key... the bolt lugs are on the front of the bolt... the ridges that stick up and lock into the barrel extension... a lot of new rifles need to be fired wet... the more lube the better... ETA PICTURE: 
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NOT REALLY BUT YES I like shooting 1000rds before I trust it but thats my SFTF M4`s if it dont jam then I think its good to go |
Its called a magazine. I've never had a magazine or rifle that couldn't run 30 rounds... |
and down loading a magazine has nothing to do with reliability... it has to do with making a tactical reload easier...  this thread should be in the troubleshooting forum... there is way too much nonsense flying around OP, as for a break in period, in a perfect world, NO there shouldn't be a break in period on a factory rifle... however, there may be some tight tolerances in the lock up areas of the bolt/extension... same problem i had with a Stag upper and CMT bolt... after running the carrier wet for a few hundred rounds... any burrs or uneven finish etc that was causing the bolt to bind up in the extension wore off, and the rifle ran 100%... CMT bolt carrier groups are my least favorite make on the market... i have only ONE rifle with a CMT bolt (a 6.8SPC bolt in a BCM M16 carrier), all of my other bolts are Colt/LMT as much as i will get flamed for saying it, when i use colt barrels and colt/lmt bolts, i have NEVER seen a problem like this... |
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Well it only took 1 3 gun event with new magpul followers and springs to show me it was a mistake to load 30 rounds. you can load as many as you like it's just my opinion. If you charge and the round is not stripped from the mag how is that considered a tactical advantage and not reliability? |
? the reason the round isn't being stripped from the mag is because you didn't full seat the mag... and it's not the gun or the magazines fault that under stress you are unable to fully seat the magazine... given an extra few seconds you could easily load a 30rd magazine on a closed bolt it would just require an extra hard "smack" to seat it, those extra seconds mean losing a match or in a real life situation it means getting shot and/or dead... tactical advantage, not reliability... unless you are talking about OPERATOR RELIABILITY... YOU cannot reliably load a 30rd magazine on a closed bolt... 
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Clean, look for burrs or foreign objects, lube and shoot. Shit happens. FYI, shotpeened bolts usually won't have burr problems. There are no guarantees, only warranties. CMMG makes good stuff. People, on average, are only 70% efficient. (Learned that in the Army. Don't know where it came from.) |
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