Burr in Bore of New AR Rifle

[dleong]

Hello, all.

I just purchased a 24" Bull Barrel AR-15 Kit from J & T Distributing. Upon examining the bore, I noticed some kind of obstruction at the gas port. I managed to knock out most of the obstruction--it was obviously a metal burr from when they drilled the hole.

However, there is still enough of a burr left that can be felt when a bore brush is pulled through the area. I called J & T up and they said it was perfectly normal for there to be burrs from drilling the gas port, and that they will be "smoothed out" once I have shot a few rounds through the barrel.

Does this sound right? I have always thought that any kind of barrel obstruction would pose a danger, and that intentionally shooting out an obstruction was a definite no-no.

I have put together several ARs and have never run into this situation with the burrs. Can I safely shoot the burrs out? Would I be damaging the barrel by doing so?

(On a side note, I wasn't too happy with the J & T kit. Aside from the burr in the bore, there were several missing parts, and the buttstock was obviously used as it was scratched up and had a cracked buttplate. The bipod stud was installed about 10 degrees off of "bottom dead center" of the handguard, resulting in a noticeably tilted rifle when using a bipod.)


DL

Edited: Learn to spell, dammit!

 

[boofus]

The 20" kit I bought from J&T had the same thing. It's just a little piece of metal from where they drilled the gas port. Just lube the gun up real good and shoot it. After a few mags the burr will be gone. Lots of people ask about it on the ar15.com forum and the answer is usually 'Shoot it out'.

Missing parts and crooked mounts sounds unusual for J&T, should probably see if they will fix/replace the parts. The parts kit I got from them was pretty good in fit and finish.

 

[Lochaber]

Shoot it out. I did and nothing bad happened.

Loch

 

[WhoKnowsWho]

Had the same thing from Model 1 Sales, couple things I had read said to expect it in most barrels from most manufacturers. Shot it out, now it is smooth and fine.

 

[MeekandMild]

I can't believe this! A rifle which shoots the primary battle cartidge the US military uses and the advice for burrs in the barrel is "Shoot it out"!
Imagine giving the same advice to someone shooting any other US military caliber from .58 cal musket to .45-70 gov to 30-06 to .308!

More than anything the Mattel Rifle fans have EVER said on this or any other forum this most impresses me with the total absurdity of giving our troops mouse guns!

OK, Mr. Bush, if you are reading this, its time to bring back the Garand, or at least the M-14!. :banghead:

 

[JohnKSa]

Imagine giving the same advice to someone shooting any other US military caliber from .58 cal musket to .45-70 gov to 30-06 to .308!

I would... What's the difference?

 

[Badger Arms]

This was an issue when they were standardizing the guns. There is no really good way to debur the inside of a 22 barrel. It turns out that the best way to do it is to, indeed, shoot it out. Perfectly normal, safe, and sane. It's safer to do it this way than to try some other hairbrained method. In fact, with the velocity and pressures experienced at that point in the bore, the hole not only gets deburred, but it gets rounded to the poin that cyclic rate is stepped up by up to 100rpm on the M16. It's par for the course, not a design flaw.

(This message brought to you by perhaps the biggest AR-15 critic on the board)