Rifling

[Walker]

Anybody seen rifling like this? Buddy brought me his ar 5.56 for a new trigger and mounting a scope on it. First trip to the range it could barely do 2-3" at 50. Scoped the barrel and there was a lot of copper fouling. After a good scrubbing this is what I see.

[Drycreek3189]

It might benefit from the lapping process. I fire lapped one of mine and it helped. Then again, it may not like the ammo you used. I have one that will only shoot well with Hornady Superformance 75 grain BTHP, but with that round it’s great.

[Bullseye07]

Is it actually rifled?


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[twosixteens]

It looks like chatter from the tooling

[Walker]

It looks like chatter from the tooling

That's what I think but I'm no machinist

[M16]

Not uncommon on cheaply made barrels. If it was a quality manufacturer I’d send it back. Might try fire lapping. Bore scopes are the cat’s meow when checking for accuracy problems.

[Drycreek3189]

That's what I think but I'm no machinist

That’s what I thought also. Are you familiar with fire lapping ?

[Buff]

It looks like chatter from the tooling

[cattlelackranch]

Looks like most savage barrels

[RifleBowPistol]

That’s interesting, definitely tooling marks. If there is any warranty send it back, if not fire lap it. My 6.5 Creedmoor barrel was quite screwed by the factory also. Groups sucked, I bought a Tubb fire lapping kit, it worked miracles on my barrel. I am still going to replace the barrel at some point, for now it is shooting a whole world better.

5.56 chambering can be hard to get to shoot accurately to begin with, I have only found one bullet my 5.56 likes, it took a while to come up with that bullet. When you have a 5.56 barrel, finding a bullet with an abrupt ogive and the proper weight range. is most likely going to give you the best results

So at this point, you are probably dealing with multiple problems that are hurting accuracy.

[adam_p]

AR barrels are cheap enough I'd throw it away and put a new one on if there is no warranty fix.

[muzzlebrake]

Typical chatter from the button being pulled thru the bore. That's why generally a hammer forged barrel is mo better IMO or a high quality broached rifling. Some barrel makers can produce a high quality single cut rifling.
Button rifling is much faster and cheaper to produce but leaves stresses in the metal that will show up when shooting and the barrel heats up causing rounds to spread around all over the place if these barrels are not stress relieved either by heat or cryogenics or both. Lots of these cheap budget barrel makers don't bother with stress relieving since it takes up too much time and labor.
This is just my opinion. No warranty implied

[Walker]

Well, we're going to the range tomorrow and see if the cleaning helped. If not I'll probable just go with a different barrel. My own 5.56 and my sons both shoot my 55gr hornady handloads real good so that's what we'll try in this gun.

[Bjayroe]

Any chance that is damage?

[Walker]

Any chance that is damage?

Nope. It's the full length of the barrel.