Where to find a threaded barrel extension?

[sigboi]

Hey guys,

Just built a pistol ar from a kit, but wanted to put my Fat Comp 2 on the end. However, the threaded part of the muzzle is recessed into the hand guard, and only a few threads are exposed. I'd like to keep this handguard, and wanted to ask if anyone knows where to find a threaded barrel extension with the same thread so that it will just extend the barrel by about half an in or 3/4 in.

The handguard is really slim, so the Fat Comp diameter is the same as the HG. I'd like to have a slight extension so that I can fit the Fat Comp either flush or with a very small gap.

Here's a few photos to show what's going on.

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[SCARed]

Buy a new barrel, buy a new hand guard, buy a new muzzle device. That's really your choices. I've never heard of a barrel extension like what you want.

 

[sigboi]

Thanks for the input, I didn't find anything like it online, but I wanted to ask the pros here to make absolutely sure.

Another think I was thinking was maybe have someone trim the handguard back half an inch to the base of the threads.

Anyone have any expertise in this? I have no experience in metalworking, but maybe its something that is easily done?

 

[erudne]

shorten the front of your hand guard, or the back, or middle, have a brass extension turned on a lathe look in an SAE catalog for an appropriate substitute

 

[Quartermaster]

TROS. Seriously. Don't cut or replace anything. He'll make you an adapter that will give you the length you need. <broken link removed>

 

[Swedish K]

the other option would be have the back half inch of your fat comp turned down to fit inside of the hand guard on a lathe. It looks like your barrel sticks out 1/10th to 1/8th inch beyond the barrel - if you use an extension you will have at least 1/4" gap if you want the extension to have any strength - either that or go with an adapter that converts to 5/8x24 (AR10 308 thread pitch) and either get the comp for 308 or have yours tapped to that pitch.

 

[jbett98]

If it was me, I would have a machinist cut the front of the hand guard down enough to thread the comp completely, but remove only the radius of the fat comp and leave the top portion of the rail alone so that it extends over the fat comp.
You wouldn't have to re-anodize the end of the rail, only touch up the newly milled ends with a Birchwood Casey Super Black touch up pen.

 

[bolus]

CNC Warrior (http://www.cncwarrior.com/) makes extensions but not for the correct thread pitch. I'd call them and see if they would make you a custom one.

 

[Doc In UPlace]

Silencerco makes a 1/2 x 28 adapter that puts a Silencerco "O" ring space after the threads. It might work:
I use them on my Ruger 22/45 and Savage Mk-II. You might want to call them to make sure it'll handle the 5.56 pressure levels.

Rimfire Adapters (https://www.store.silencerco.com/products/rimfire-adapters?variant=1107305868)

 

[Velzey]

That would be a custom thread adaptor for sure! But you maybe able to find one online. I didn't see one on tros website.
One could be made from a barrel stub that already has the outside threads cut on it.

1/2-28 - 1/2-28, and leave enough room to use a crush washer for flush alignment.

I know a gunsmith that has a lathe, if you cannot find what your looking for!

 

[sigboi]

If it was me, I would have a machinist cut the front of the hand guard down enough to thread the comp completely, but remove only the radius of the fat comp and leave the top portion of the rail alone so that it extends over the fat comp.
You wouldn't have to re-anodize the end of the rail, only touch up the newly milled ends with a Birchwood Casey Super Black touch up pen.

Great idea, I was actually contemplating if that was possible as I was staring at it. It would give a nice integrated look.

Any good machinists one here willing to help me out? Live in South Seattle, Willing to pay in beer, Georgetown Brewery Manny's.... Mmmm... or whatever currency is popular atm.

Thanks for all the great input guys! I think trimming back the hand guard would be the most cost effective way, would also make the OAL a half in shorter as well.

 

[jbett98]

If you tried to shorten the back end of the hand guard, your picatinny rail slots wouldn't have the same spacing as the receiver.
I have cut aluminum on my table saw and if you had it jigged up vertically tight enough, it would only take one pass at the right saw blade height to cut a slot right below the rail section you want to save. then lay the bottom flat and run it thru to the proper length.

 

[KDuB]

Hey guys,

Just built a pistol ar from a kit, but wanted to put my Fat Comp 2 on the end. However, the threaded part of the muzzle is recessed into the hand guard, and only a few threads are exposed. I'd like to keep this handguard, and wanted to ask if anyone knows where to find a threaded barrel extension with the same thread so that it will just extend the barrel by about half an in or 3/4 in.

The handguard is really slim, so the Fat Comp diameter is the same as the HG. I'd like to have a slight extension so that I can fit the Fat Comp either flush or with a very small gap.

Here's a few photos to show what's going on.

View attachment 299761 View attachment 299762 View attachment 299763
A 1/2x28 too 1/2x28 barrel adapter will work. I have a ICD BFD XL and that's what I'm gonna has to use for mine!

 

[KDuB]

1/2x28 too 1/2x28 barrel adapter/extender will work.