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Posted: 3/30/2015 7:45:44 PM EDT
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Having some interesting issues with poor ejecting from my M1A. I am getting rounds that just barley dribble out to the 1o' position. I would say 50% of a full magazine will eject to the 1o' and the rest will eject normally to the 3o'. I don't get very many stoppages but do get an occasional round that ejects and gets caught by the bolt carrier.
I've run the gamut of ammunition all with similar results. German DAG, Federal 7.62x51, SA, PMC, etc... The mags I am using are Springfield Armory 20 rounders. Any suggestions? |
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Unload the firearm, dis-assemble, clean thoroughly, and lube it properly. Check that gas tube plug is tight.
Check inside of stock to see if there are wear indications on the stock where the op rod is rubbing against the wood. If so, carefully remove enough material from the stock so that no interference occurs. Try all this, and report back. |
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Quoted:
Unload the firearm, dis-assemble, clean thoroughly, and lube it properly. Check that gas tube plug is tight. Check inside of stock to see if there are wear indications on the stock where the op rod is rubbing against the wood. If so, carefully remove enough material from the stock so that no interference occurs. Try all this, and report back. Sorry, I meant to say that I gave it a thorough cleaning/lubing and field stripping. I'll double check to see if there is any issue with the oprod rubbing and the gas plug is good to go. |
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Quoted:
Having an extra set of bolt parts on hand is a good idea even if you don't need the ejector spring yet. 
ETA- just for clarification on the background. is this a new gun, new to you? Or have you had this gun running well in the past? New to me. Judging by the barrel wear and bolt wear, it had less than 2k rounds through it. It ran fine over the summer but it was pretty warm when I shot it. I don't think I shot the gun on a day it was under 80 degrees. |
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Quoted:
Sorry, I meant to say that I gave it a thorough cleaning/lubing and field stripping. I'll double check to see if there is any issue with the oprod rubbing and the gas plug is good to go. Quoted:
Quoted:
Unload the firearm, dis-assemble, clean thoroughly, and lube it properly. Check that gas tube plug is tight. Check inside of stock to see if there are wear indications on the stock where the op rod is rubbing against the wood. If so, carefully remove enough material from the stock so that no interference occurs. Try all this, and report back. Sorry, I meant to say that I gave it a thorough cleaning/lubing and field stripping. I'll double check to see if there is any issue with the oprod rubbing and the gas plug is good to go. Check that the gas cut-off is set properly. It might be remotely possible that it has moved. It's also possible that you might have to use the properly-sized drill to remove any carbon build up in the gas orifice in the underside of the barrel. Double-check that the gas piston has been installed properly. Since the rifle has worked well in the past, with higher temps, it's possible that cold temps have a bearing on this. Very cold temps have a tendency to de-energize firearms propellants a little bit, so possibly ammo related. A new op-rod spring would not be at all out of order at this point, IMHO. A new ejector spring ditto. Please describe exactly how you cleaned and lubed the bolt. What did you use for lubricants on the rifle and various components? What thing(s) changed since the rifle worked well? |
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I can only add my experience that sounds like it's related to your problem OP.
A few years ago I was trying various gas pistons trying to improve accuracy. One of the pistons was a Sadlak NM piston that has the groove in it. The ejected rounds basically fell out and went mere inches away. Based on that the only thing that comes to mind is a possible problem with your gas piston or piston chamber, but it's late for me so ... |
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If you had it running well before I would lean toward a cleaning issue.
I'd take the gas piston out, clean it, clean the gas cylinder, clean the inside of the gas plug too. Clean the gas shut off screw oriface. Leave all them bone dry on the inside. If you lubed it you might be gumming up the lube with powder forming a dirty paste. If you greased the interior parts for storage like I do, you must remember to clean them of the oil and grease before the next range trip. Excess bore solvent can also migrate into the gas system via the shut off screw. One is often cautioned to clean the guns upside down in a cradle to keep the solvent in the bore. You might also take a look at your ejector spring. Tear the bolt down and look at the spring, are there still gaps showing between the coils? I like to compare old ones springs with a new unused one, I was especially doing that with Garands as they were all over the map in wear from CMP. That's all I got if your op rod is rubbing on the stock. |
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I just had a bit of an epiphany. Did you perchance take your gas cylinder completely off and then put it back on, shoving it all the way down with the gas cylinder lock and then crank the plug?
If so you check you gas passage, you may have moved the gas cylinder over the barrel port. A small bent wire to check the orifice alignment before installing the gas plug. If it's plugged you likely have to back the gas cylinder lock off a turn. Basically you need to align the barrel hole and the gc hole. You can crank it down too far passing the ports or partially misaligning them. That would certainly cause you a problem after a take down and cleaning. Raf mentioned putting it on correctly but he didn't explain it. If that's the problem don't feel bad, i did it too when I had got my M1a. |
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Sorry this took me so long to reply. I really appreciate everyone's replies and wanted a chance to try everyone's suggestions.
I went ahead and did another thorough cleaning and lube. I noticed there was a good amount of brass on the underside of scope mount (I don't have a scope mounted on it but never replaced the scope mount part where stripper clip guide goes). I removed the scope mount part and it runs like a champ now. It looks like it was deflecting brass down into the chamber. Not sure why it wasn't doing that before. |
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