Basic Info on Threading Barrels for a Suppressor


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Justin
February 4, 2011, 01:48 PM
So, I'm finally taking the plunge into the world of NFA items. I've taken the first baby step of ordering a Tactical Solutions .22 suppressor.

I've got a couple of guns I'm looking to use this can with that don't currently have threaded barrels, including a Ruger Mk II (http://multigun.wordpress.com/2010/06/30/couple-of-tests/), a 10/22, and a CZ 452 in .17 HM2, and possibly a spare barrel for a Walther GSP.

How difficult is it to get a barrel threaded?
Generally speaking, what will it cost?
Is this the sort of thing that any competent gunsmith can do?
Should I ask them to fabricate a screw-on thread protector as well?

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Zak Smith
February 4, 2011, 03:34 PM
Mechanically it's not hard. We do it on a CNC lathe. From a consumer perspective the "hard" part is finding someone you trust to do the work right.

$80-120 depending on if we have to take it apart and if you want a thread cap.

With the right tools yes-- the key word here is "competent", but it becomes somewhat tautological.

Thread protectors are not critical, but they are nice if you are going to shoot the guns a lot without the suppressor on.

For my bolt rifles, I don't have/use them.

Justin
February 4, 2011, 05:24 PM
Thanks, Zak. As always, you get right to the heart of the matter.

As for finding a competent gunsmith, speaking as a mechanical layman, I suppose that would be defined as someone who's able to execute the job such that attaching/removing the suppressor is easily done, the addition of the threads doesn't adversely impact the accuracy of the gun, and that the final product doesn't unduly mar or aesthetically damage the gun.

Prior experience doing similar work would, of course, be a plus.

Zak Smith
February 4, 2011, 05:56 PM
Ask them how they do it. If it involves the words: center on bore, CNC, single-point, ring gauge, class 3A, thread relief, then you're probably good to go.

The threads themselves have to be concentric with the bore, and the shoulder behind them has to be exactly at a right angle to the bore. The threads do not hold the suppressor straight, the shoulder does that. If the threads are not concentric or the shoulder is not square (ie bore is normal to plane of shoulder), you're going to have problems.

The biggest thing we see as a problem are threads that are cut to no spec, or are very tight. This often leads to a situation where the person has got the suppressor stuck on, or stuck halfway off, and can't turn it. Typically the threads have galled and the solution is to cut off the barrel, rethread it properly, and then repair the suppressor threads.

Magoo
February 4, 2011, 11:49 PM
I just wanted to add that if the person doing it is a Class 3 dealer, it might be a good idea to leave the suppressor with him. When I got a barrel threaded, the smith asked me what can I was going to use. I thought it strange he wanted to know more than "10-28". He said the threads on mine (a Prodigy) were slightly different than other 10-28 threads, even within the AAC lineup. He tried to explain it/ show me, but I didn't see it- but I'm no machinist.

GoingQuiet
February 5, 2011, 12:03 AM
I just wanted to add that if the person doing it is a Class 3 dealer, it might be a good idea to leave the suppressor with him. When I got a barrel threaded, the smith asked me what can I was going to use. I thought it strange he wanted to know more than "10-28". He said the threads on mine (a Prodigy) were slightly different than other 10-28 threads, even within the AAC lineup. He tried to explain it/ show me, but I didn't see it- but I'm no machinist.
It's actually 1/2 x 28, not "10"

UnknownGunMan
February 5, 2011, 07:55 PM
I'd suggest checking with the Silencer Manufacture before having your barrel threaded.

Some 1/2x28tpi cans need .400 length, some need .625

Depends on your suppressor, and the caliber.

There are a few guys on GBroker I've used for threading .22LR's $50 shipped.

For anything else I use http://www.AquilaFirearms.com, they do work for Gemtech, AAC, and a few others. Pretty descent prices, FAST turnaround, and Excellent quality!

For those guns hard to thread... Tornado Technologies is the place to go...

USMACHINEGUN.COM
February 6, 2011, 12:09 PM
we have a lot of them with a thread protector. Its a clean look when finished:
http://www.usmachinegun.com/proddetail.php?prod=BT-RM2

Andrew Wyatt
February 6, 2011, 02:35 PM
if you can, get a drawing of the thread specifications, including the shoulder from the manufacturer, and keep it with the can.

jmorris
February 6, 2011, 04:53 PM
It is a simple task once you have the barrel indicated in the lathe. Any competent smith or machinist can handle it. You don't have to have a CNC or anything other than a good lathe.

Larry Ashcraft
February 6, 2011, 07:01 PM
Justin, I would suggest my friend Bruce (I'm not going to post his last name because I don't have his permission). He's based in Pueblo West and specializes in 1000 yard benchrest guns. He's an absolute perfectionist when it comes to his machine work. AND, he started building suppressors with a partner a few years ago and then decided the legal stuff was too much hassle and quit.

I've fired a Mark II with one of his cans on it (inside my shop, no less. Shhh.). It was a work of art.

PM me if you want a phone number.

41magsnub
February 7, 2011, 09:52 PM
This guy did my 10/22 and I couldn't be happier with the end product. He even set back the front sight dovetail so I can still use irons. A thread protector was in included.

http://www.jpgrips.com/

berettaprofessor
February 11, 2011, 01:37 PM
Funny Justin, I took the exact same baby step and purchased the exact same suppressor model on the same day. :) Hoping to score one of the new Ruger 22/45's w/ threaded barrel and then buy a barrel for one of the 10/22's.

I'm not going to take the advice of a friend who suggested I simply thread my existing 10/22 barrel myself with a Tap and Die set though....he's a more experienced shooter than me, but I'm betting I could never get the holes to line up :)

Here's hoping the paperwork goes through....I did it through a Trust, but the instructions from my Class III dealer who was filling out the paperwork was a little different than the ATF's instructions. The dealer insisted I still stick on the 2X2 pictures since I'm the trustee for my own trust...and wanted me to attach a Schedule A NFA items listing to the Trust paperwork....which I didn't do the latter because I don't have any NFA items....yet!:what:

Bubbles
February 11, 2011, 04:48 PM
...he started building suppressors with a partner a few years ago and then decided the legal stuff was too much hassle and quit.
I hate to hear stories like that. I wonder how many firearms innovations have been stifled due to government over-regulation.

berettaprofessor
February 19, 2011, 07:02 PM
Just saw that my $200 check to ATF cleared the bank. Anybody know if that means that approval has already gone through the ATF office?

Bubbles
February 19, 2011, 10:19 PM
Just saw that my $200 check to ATF cleared the bank. Anybody know if that means that approval has already gone through the ATF office?
Sorry, cashing the check is the first step. You're still looking at a few more months of waiting.

Eagle-101
February 26, 2011, 02:35 PM
I can attest to that. Been waiting a few months myself......:cool:

DoubleTapDrew
February 26, 2011, 03:48 PM
Just saw that my $200 check to ATF cleared the bank. Anybody know if that means that approval has already gone through the ATF office?
They are quick to cash the check. They cashed mine the day after they received my packet. Then the wait starts. I wonder if they would be quicker if they were not allowed to cash it until the stamp has been issued.

rjrivero
February 26, 2011, 07:19 PM
Here's a time line on my last 2 suppressors, just to give you an idea of the turn around time.

NFA Item: Suppressor Ops Inc 16th
Form Type: Form 4
Transferee Type: LLC
Form 4 Sent: 11/10/10
Delivered: Sent without tracking.
Check Cashed: 11/16/10
Pending Date: 12/8/10
Approved Date: 1/10/11
Form 4 Received:1/13/11
Picked up from Dealer: 1/13/11
Examiner Name: Al Lamberger

NFA Item: Gemtech Alpine .22LR Suppressor
Form Type: Form 4
Transferee Type: LLC
Form 4 Sent: 11/11/10
Delivered: Sent without tracking.
Check Cashed: 11/16/10
Pending Date: 12/7/10
Approved Date: 1/10/11
Form 4 Received: 1/13/11
Picked up from Dealer:1/13/11
Examiner Name: Al Lamberger

Dr.Rob
March 16, 2011, 05:42 PM
I was about to post the SAME question. Funny that. I'll probably just contact Zak about cutting my Mark 2, rather than buying a pac-lite upper.

If you enjoyed reading about "Basic Info on Threading Barrels for a Suppressor" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!