MarshallDodge
Member
Here is an old thread on the subject
I think straight 30W would be my choice for longevity but any weight will do to help the gun cycle.
AR 10 FTE
- Thread starter ExAgoradzo
- Start date
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I think straight 30W would be my choice for longevity but any weight will do to help the gun cycle.
I just shot my PA 10 today, about 20 rounds, but this takes the number up to around 300, about 200 Tulammo, and around 100 Speer TNT/H335 handloads. The rifle has not had a problem yet, and all its seen is 5w20, 0r 5w30, conventional, much like bearleft said. Worth mentioning I have an old M&A rifle with a Bushmaster barrel in .223 thats seen well over 20,000 (the number where I stopped counting about 12 years ago)from 14 to 110 degrees, in snow, and sandstorms, lots of ran, very dirty in all the weather both sides of WA state has, in all seasons with zero malfunctions, and thats limited to 5w30 conventional. The point I'm making is that a good AR does not require special lube, and a bad AR will not run even with it.
Do not use the FrogLube on your AR- unless you want to glue the action shut.
Budshad
Member
- Joined
- Mar 17, 2019
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- 16
I had the same exact problem with my DPMS not ejecting. Took it to my shadetree gunsmith buddy and he aligned something on the head of the bolt. Something had moved out of place causing the extractor to pinch the bullet so that it wouldn’t let go during ejection. Not sure if yours is doing the same thing but I hope that helped.
Aintso
Member
- Joined
- Aug 18, 2018
- Messages
- 23
I have a mostly Aero AR in 308 with what sounds like the same problem. The only way it will eject somewhat reliably is the the gas block wide open, and even then 1 in 20 rounds will stove pipe or not exit the port. The brass is dented pretty badly from contact with the deflector, then bounces almost straight forward for a 1:00 ejection angle. Less gas renders a lazier version of the same events with much more frequent ejection failures. The best I can determine there's a problem with bolt face/ejector/extractor interaction. I've improvised new extractor & ejector springs. Even made new ejectors of different lengths, and profiles. Ammo used is Lake City. Short of randomly buying new parts to try, I've run out of ideas, and have given up on it for the short term.
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ExAgoradzo
Member
So,
I lubed. Mobil1 Synth on all the parts and sprayed Rem oil on places it made more sense to do that.
I also checked the gas tube/block/barrel was good by shooting brake cleaner through the tube (wearing glasses). The cleaner came out very cleanly, so I don’t think misalignment is the prob.
I put an empty shell in the chamber and racked the charging handle a few times, case extracted fine.
I also inserted aN empty magazine and let the bolt come down on it, the BCG stayed in place.
I pressed the bolt thingy that won’t let it close (sorry, still new to ARs. When I pressed the lever it closed just fine.
I am shooting in a different place this Sunday afternoon, I won’t be able to sight in the scope at this location, but I will be able to make sure the rifle is better than a bolt action there.
Anything I’m not considering?
Wish me luck.
thanks,
Greg
I lubed. Mobil1 Synth on all the parts and sprayed Rem oil on places it made more sense to do that.
I also checked the gas tube/block/barrel was good by shooting brake cleaner through the tube (wearing glasses). The cleaner came out very cleanly, so I don’t think misalignment is the prob.
I put an empty shell in the chamber and racked the charging handle a few times, case extracted fine.
I also inserted aN empty magazine and let the bolt come down on it, the BCG stayed in place.
I pressed the bolt thingy that won’t let it close (sorry, still new to ARs. When I pressed the lever it closed just fine.
I am shooting in a different place this Sunday afternoon, I won’t be able to sight in the scope at this location, but I will be able to make sure the rifle is better than a bolt action there.
Anything I’m not considering?
Wish me luck.
thanks,
Greg
FL-NC
Member
Sounds like a gas problem- either in the gas block or loose key in carrier. I recommend generous amounts of white lithium grease in the BCG for lube.
MarshallDodge
Member
Friends don't let friends lube their carriers with grease.
ExA, don't forget to do a lock back check. That is, place a single round in a mag known to be good. Load the rifle and fire it. If the carrier locks back, good! Rifle isn't under gassed. If it doesn't lock back, there's a problem with the gas drive.
I suspect the heart of the problem is the extractor springs. Most 308 ARs have underpowered extractor springs.
ExA, don't forget to do a lock back check. That is, place a single round in a mag known to be good. Load the rifle and fire it. If the carrier locks back, good! Rifle isn't under gassed. If it doesn't lock back, there's a problem with the gas drive.
I suspect the heart of the problem is the extractor springs. Most 308 ARs have underpowered extractor springs.
Assuming that this is a standard kit from a reputable manufacturer, my guess would be that the gas block isn’t line up with the port on the barrel. Is that a free float rail I you installed? Is the gas block pushed right up against the ledge in the barrel intended for the ring that holds on stock hand guards? If so, the block is probably misaligned.
Spraying cleaner down the gas tube won’t tell you much because it’s probably aligned enough to make the bolt move, just not enough for a full stroke. If it was completely misaligned, the bolt wouldn’t move.
Spraying cleaner down the gas tube won’t tell you much because it’s probably aligned enough to make the bolt move, just not enough for a full stroke. If it was completely misaligned, the bolt wouldn’t move.
MarshallDodge
Member
Well, I guess I am not your friend
In my opinion, grease is okay as long as you use something that stays stable in all temps, and apply it sparingly. I use Superlube grease, which is teflon based, on my BCG and apply it with a Qtip. Just enough to make the surface appear wet.
Well, I guess I am not your friend
In my opinion, grease is okay as long as you use something that stays stable in all temps, and apply it sparingly. I use Superlube grease, which is teflon based, on my BCG and apply it with a Qtip. Just enough to make the surface appear wet.
Man, I don't know about this. Grease doesn't do so great in freezing cold weather and in hot weather it doesn't do anything that a good lube won't. I guess it could be argued that the grease won't run, but that's not a good thing. Lube is supposed to run and the working of the action using the lube as a medium is what displaces crud when it builds up. With grease, the crud doesn't get displaced. It just stays there acting as an abrasive.
When you were a kid, working on a go cart, car, whatever, and having to lap parts together and having to buy lapping compound, but no way to go buy it because you were working on what would get you there, we made our own. Guess what we used...grease mixed with an abrasive. Guess what you have in the innards of your rifle/handgun when that grease gets full of crud. Unless you're doing some sort of specialized shooting and NEED grease (I used to put grease on the lugs of my 40X bolt), grease shouldn't be any where near a working firearm. All it serves as is a trash magnet.
Waterboy3313
Member
Has the BCG ever been disassembled? If not I would pull it apart clean it and lube with oil. While it's apart check the gas rings. When I was new to ARs I had a few issues. Most of my issues besides having a weird buffer and spring in one were all resolved by a good thorough cleaning and using gun oil rather liberally before break in.
Keeping things clean and lubed will at least let you check off two things on the list of possible failures.
Keeping things clean and lubed will at least let you check off two things on the list of possible failures.
OP
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ExAgoradzo
Member
I took the BCG apart and lubed it up.
Then I did the same with my AR 15. It was filthy. Note to self!
I followed the instructions I found in how to lube. It all seemed pretty common sense once I saw what needed more lube and what just needed a spray.
Can’t wait till Sunday afternoon. I’m looking forward to this shooting cleanly so I can take it up north again and sight it in.
Greg
Then I did the same with my AR 15. It was filthy. Note to self!
I followed the instructions I found in how to lube. It all seemed pretty common sense once I saw what needed more lube and what just needed a spray.
Can’t wait till Sunday afternoon. I’m looking forward to this shooting cleanly so I can take it up north again and sight it in.
Greg
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