Gunsmithing AR15 barrel with bad threads

[magnum_99]

I have a 16" AR15 barrel with threads that are not concentric to the bore, (I want to use it with a suppressor). As I understand it, a sleeve can be attached to the barrel (welded or soldered) and new threads can be cut concentric to the bore, so that the muzzle device/mount can be attached and a suppressor used.

Is that that the process? Who can do this/what is an average cost? Thanks.

 

[9H_Cracka]

Re: AR15 barrel with bad threads

Considering you can buy a decent 16" AR barrel for about $150, doing what you described above is chasing a nickel with a ten dollar bill.

Pull the barrel, sell it to some non-suppressor user on BARF.com, and move on to a good barrel with good threads.

 

[mscott]

Re: AR15 barrel with bad threads

Good advice from 9H. You'll have $100 in getting what you have fixed.

How do you know the threads are off?

 

[gunnergirl81]

Re: AR15 barrel with bad threads

+1 on all the above.

I am curious to know how you determined the misalignment. Also what brand the barrel is.

 

[magnum_99]

Re: AR15 barrel with bad threads

Colt barrel. Visual check and gunsmith confirmed.

Off the shelf barrels are not guaranteed to be right. I don't want to buy multiple barrels to get one good barrel.

If someone can tell me where I can get a 16" chrome lined barrel threaded for a suppressor for $150 I will thank you and buy it immediately.

 

[mscott]

Re: AR15 barrel with bad threads

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: magnum_99</div><div class="ubbcode-body">Colt barrel. Visual check and gunsmith confirmed.
</div></div>

Why not have that gunsmith fix it?

You might contact ADCO as they do quite a bit of work on ARs and deal with suppressors, so they'll have an understanding of what needs done.

 

[codlinjr]

Re: AR15 barrel with bad threads

Not to hijack... but do do most AR barrels come from the factory with the correct thread dimesnsions for any suppressor then? I understand that they will be .5x28 but are the other dimensions all standard as well so that a suppressor from brand x, y, or z will fit on correctly with no re-threading needed? Just unscrew brake/flash hider and screw on can?

BTW, I have also heard that colts bbl threads are often not concentric to the bore

 

[gunnergirl81]

Re: AR15 barrel with bad threads

Few production barrels are perfectly centered on the bore in reference to the outside dimension. We have a Rossi Wizard barrel on the lathe right not that at the 19" mark with an OD of 0.625 is so far off center that when we turned it down to 0.50 there is no shoulder on one side.

There is no fix for screwed up threads. You cut them off and start over. That leaves you with an SBR as you've now gone below 16". Go check out JSE surplus. Call the girls there and tell them what you want and that it needs a threaded muzzle for suppressor use. If they send you one that doesn't indicate good, send it back and I'm sure they'll swap you out. They're good folks.

 

[thespecialist]

Re: AR15 barrel with bad threads

There's one other option to registering it as an SBR and cutting the barrel shorter, but it's not the best option IMO.

If you are just determined to use that barrel, and are using a suppressor with a quick release flash hider or brake, you can cut and rethread the barrel and have the FH/brake permanently installed to bring the barrel to 16". The downside is, you'll be stuck with that setup.

Me personally, I'd heed the advice given by Kenda and just replace the barrel.

 

[HPLLC]

Re: AR15 barrel with bad threads

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: magnum_99</div><div class="ubbcode-body">Colt barrel. Visual check and gunsmith confirmed.

Off the shelf barrels are not guaranteed to be right. I don't want to buy multiple barrels to get one good barrel.

If someone can tell me where I can get a 16" chrome lined barrel threaded for a suppressor for $150 I will thank you and buy it immediately. </div></div>

ADCO sells suppressor threaded barrels, but they are more like $300.

What kind of suppressor were you planning to use?

Sometimes you can finagle a fix. It's not the best thing to do, but it can work.

Did you try truing the thread shoulder to perpendicular with the bore? That can achieve good alignment if the threads are not tight.