AR .308 jamming question

[Daniel75]

My buddy has a brand new Bushmaster .308 MOE, shot 40 rounds through it and had no problems. Took the rifle to work and his buddy took it apart to inspect it (why, I have no idea) and after that it's not ejecting the spent casing all the way and jamming when the fresh round feeds into the barrel.

He let his OTHER friend look at it after it started jamming and that friend says its a head spacing issue, which I read is extremely rare for a manufactured gun and not one that's put together piece by piece like a custom build. He's going to get me the rifle so I can take a look at it in a day or two, but I can't think what might have went wrong by just taking apart the upper and lower and removing the bolt assembly?????

Has anyone had a similar problem? I told him to buy a Rock River!

[KHoes203]

Mine did that with steel case ammo and put brass back in it and it works just fine!

[Swampa]

Did he change ammo?

[Stan R]

Were any of the magazines dropped? What the others said ammo?

The parts only fit one way....

[47]

Just a guess...but, ?

[Daniel75]

I know, I told him the same thing, it's idiot proof, they'll only go in there one way. He hasn't answered back on ammo. I told him when he bought the gun not to put steel casing through it but he's not real savvy on guns. This is his "hog/deer" rifle for hunting hahaha. I told him a bolt action .270 would be a dynamite choice but he wanted something that looked cool too.

[47]

I know, I told him the same thing, it's idiot proof, they'll only go in there one way. He hasn't answered back on ammo. I told him when he bought the gun not to put steel casing through it but he's not real savvy on guns. This is his "hog/deer" rifle for hunting hahaha. I told him a bolt action .270 would be a dynamite choice but he wanted something that looked cool too.

Form over function, it'll bite you in the *** every time.

[Daniel75]

Form over function, it'll bite you in the *** every time.

I know. I tried to explain how a bolt action will always function 99.9999% of the time unless you take it on a hunt in the arctic and it's 75 degrees below zero and you had too much oil on it and it froze, other than that it's golden. It's hard explaining this to a non-gun person and I'm sure the reasoning was way over his head because I can't expect him to pick up in an hour what it took me years and years to learn.

[Tommyh]

Highly doubt headspacing issue. Is it dry? Steel cases may be the cause but not likely. Clean the chamber well. Inspect it for burrs or the smallest piece of anything. I doubt it was taken apart too far for the inspection as well. Does the bolt lock with a single round fired?

[Daniel75]

Ok he says Winchester ammo, never changed ammo. His buddy had a problem with the pin when he took it apart, after that jam after jam.

[Daniel75]

Yes it jams on every round. The way he describes it is it won't fully eject the empty casing and jams the fresh round on the old one.

[az2tx]

Take it apart and clean it, I had a simular issue with a R-25 and it built up carbon in the bolt real quick, did he clean it before he shot it?

[BUCKSTAR]

If the rifle feeds ok from a locked back bolt, the recoil spring is fine (feeding 1st round from mag). If the rifle is short stroking, low powered ammo or a leaking gas block could be the problem. The AR runs best wet so make sure the bolt carrier is lubed well. Also make sure the gas tube is aligned properly to the bolt carrier and not binding,

[Daniel75]

He didn't clean it before he shot it.

[az2tx]

He didn't clean it before he shot it.

he should have