Jammed AR

[Guest KCSTEVE]

A Buddy of mine purchased a new CMMG AR locally. After a few rounds of new ammo the rifle jammed closed. The seller fixed the jam and said that it was caused by too much oil in the bolt assembly. My Buddy has maintained guns all his life so I don't think that he went stupid with the oil.

So, from you guys that have run the AR, is the line really that fine between too much oil and not enough oil?

[Mdunntn]

What kind of ammo was he using? I wouldn't think to much oil would cause a jam.

[NashvilleStage]

I'm not familiar with AR's in particular, but I've heard of *cases* getting stuck in the chamber when switching from steel-cased ammo to brass-cased ammo without cleaning the chamber first.

Not sure if that's part of the problem or not...

[Guest KCSTEVE]

What kind of ammo was he using?

I'll find out.

[Kenstaroni]

I've had cases get stuck because of running steel then brass ammo, or in some cases just from running steel then letting the rifle cool before running steel again.

I'd get a chamber brush and some Hoppe's and clean the chamber and bore really well. Then lightly lube the bolt where necessary, but don't soak it down with oil. Try running the gun again and report on ammo. If you're running steel then that's likely your problem as some rifle handle it without issue and other's don't run it well. If it's all brass ammo make sure it's new and not reloaded. My buddies Colt didn't like my reloads while my two rifle's eat them like candy....just a tighter chamber on the Colt I guess.

Good luck!

[Guest bkelm18]

I had a Wolf steel round jam in my AR. Had to use a wooden dowel down the barrel and a hammer to knock it out.

[Guest buttonhook]

is it a .223 or 5.56 upper. He could have been shooting the wrong ammo. If he was shooting 5.56 in a .223 that not a great idea. the over pressure could have swelled the case and jamed it up.

[Guest KCSTEVE]

-

Edited December 15, 2010 by KCSTEVE