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AR10 malfuction help

 
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  #1  
Old 08-21-2012, 11:18 AM
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AR10 malfuction help

I have an Armalite AR-10 308 24 inch SS BBL that I bought used, it shoots nice, but the last time I went out it was jamming.

I'll try to describe the details.

What it was doing is not extracting the spend 308 case and jammed it back into the action, smashing the case mouth.

I took it apart cleaned the Bolt carrier all up oiled it and action. Took out the Buffer spring cleaned and and lightly oiled it.. and now it works.

BUT
I am not sure ehat was wrong because it did not seem dirty, I cleaned and oiled the BCG and action 30 rounds before the jam in the 1st place,

It did this will all the magazines 10's 20's 25's with only 3 to10 rounds in them

A friend of mine who was with me with his AR-15 says he thinks the Buffer spring is too heavy. It has a Tronstone stock if anyone has ever heard of it.

He thinks it has a heavy duty spring in it to reduce recoil the precious owner might have put in. but since he is used to Ar-15 with a much lighter buffer spring who is to say what heavy is to him.

he could be right, as it seems to jam when oil is not drenched on parts, and I think maybe the buffer spring is a heavy one and everything has t o be perfectly oiled up for the cases to extract, any slight friction and the action does not go far back enough.
I am a Bolt guy, so I am new to the AR platform and this is just my mechanical guess. and I could be way off here. Any help from you pros would be great.

I am shooting right now 168 SMK, 24.0 H4895. Not a max load, but not a light load either
my plan is to shoot 125 to 150's once my 168 are used up


I am worried it will not function with 125's or even 150's even when oiled up.

does AR10's need to be drenched in oil to function?

does this seem like a gas port issue?.

thanks
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  #2  
Old 08-21-2012, 12:46 PM
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Re: AR10 malfuction help

It could be a gas issue, but I'd probably try a standard buffer spring first. You might also want to check to make sure it has a standard weight buffer as well.
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Old 08-21-2012, 02:07 PM
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Re: AR10 malfuction help

I'm assuming that's 42.0 grains, not 24.0? At 24.0 grains, I'd be surprised you'd be able the gun to function at all.
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Old 08-21-2012, 02:56 PM
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Re: AR10 malfuction help

Quote:
Originally Posted by Kevin Thomas View Post
I'm assuming that's 42.0 grains, not 24.0? At 24.0 grains, I'd be surprised you'd be able the gun to function at all.

Sorry about that, I'm thinking 223, same powder (H4895) and 42.0 grains is what I use

Last edited by scottyd2506; 08-21-2012 at 05:05 PM.
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  #5  
Old 08-21-2012, 02:58 PM
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Re: AR10 malfuction help

Quote:
Originally Posted by tatersalad View Post
It could be a gas issue, but I'd probably try a standard buffer spring first. You might also want to check to make sure it has a standard weight buffer as well.
forgot to maintain earlier, the rifle throws brass at 2 oclock.

how can I tell what is standard weight? (buffer)
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  #6  
Old 08-21-2012, 04:05 PM
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Re: AR10 malfuction help

Scottyd,

43.0 grains isn't a light load, either. When the 308 was the "standard" cartrdige used for across the course competition, 41.0-42.0 grains was what EVERYONE was using. No such thing as load development for an M14 or M1A. You stuck 41.5 (or so) grains of 4895 in a case, topped it off with a 168 and went to the range. If the gun didn't shoot it, you had a gun problem, simple as that. Might try backing it off a grain just to see, but I doubt that's the problem here. In the process of building up an AR-10 right now for long range competition, but it will be a while before that's up and running. We'll be geared towards the 185s for 1,000 yard shoots, but other than that we might be able to see what else is going on here.
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Old 08-21-2012, 04:17 PM
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Re: AR10 malfuction help

Check the torque on the gas key. Call aramilite and ask what buffer should be in the rifle and what the recoil spring should measure when you pull it out of the stock.

There is no such thing as to much oil in an ar and don't oil the buffer spring.
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