One question that has always been a mainstay in our most-questions-asked category is whether a specific silencer will fit a specific gun. With threading looking similar, and acronyms being thrown around like hot tamales, we understand your plight. As the suppressor industry grows, it seems thread pitch options have too.
While some thread pitches are more popular than others due to military use or it being made common by specific firearm manufacturers, the last thing you want to happen is to finally get your suppressor in and realize that it doesn’t match up with your host firearm’s threading.
The list that we are providing you is to serve as a reference for quickly locating how your barrel may be threaded. Remember that factory barrel threadings and after market threadings aren’t always the same.
Firearm Threading Abbreviations
M = Metric (for example - M13.5x1 LH means that the numbers are metric instead of standard)
LH = Left Hand (for example - M13.5x1 LH means the threads are backwards from what you typically expect. This thread pitch would require righty-loosey, lefty-tighty...)
RH = Right Hand (for example - M16x1RH means the threads work how you typically expect (righty-tighty...). If there is no LH or RH designation - RH is the default)
TPI = Threads Per Inch
Now that you have your commonly-used threading abbreviations, let’s get into caliber specific threading.
Common Barrel Thread References
.22 LR, .22 MAG, .17 HMR
The standard thread for rimfire calibers is 1/2x28.
Many .22LR pistols have barrels that are threaded underneath the slide. Some examples of threading underneath the slide include the Ruger SR, Walther P22, Sig Mosquito, and GSG 1911. Because of the thread location, these pistols require an adapter that will move the threads in front of the slide and allow you to attach a suppressor.
We should also note that some CZ rifles use a 1/2x20 thread pitch. Because of this thread pitch, in order to thread a suppressor onto the CZ rifle, it will require an adapter.
1/2x28 is the most common thread for 9mm weapons - both pistol caliber carbine (PCC) and handgun. There are a few firearms that run different barrel threads.
H&K weapons use the M13.5x1 LH thread pitch
Glock weapons use the M13.5x1 LH thread pitch
Sig Sauer weapons use the M13.5x1LH thread pitch (with an exception of the P320 variants which run New Hampshire made barrels in 1/2x28)
H&K MP5-N uses the 1/2x30 thread pitch
9/16x24 is the most common thread pitch for .40 cal firearms. Here are the exceptions to the above rule:
H&K weapons use the M14.5x1 LH thread pitch
Glock weapons use M14.5x1LH thread pitch
Sig Sauer weapons use the M13.5x1 LH thread pitch
.578x28 is the most common thread for .45 cal weapons. As you’ve seen, there are always exceptions:
H&K weapons use the M14.5x1 LH thread pitch
H&K USP Tactical uses the M16x1 LH thread pitch
H&K Mark 23 (SOCOM) uses the M16x1 RH thread pitch
KRISS Vector SMG uses the M16x1 LH thread pitch
Glock weapons use the M16x1 LH thread pitch
Sig Sauer P220 uses the .578”x28 thread pitch
AR-15s generally use the 1/2x28 thread pitch, but there are a few that do not:
H&K weapons use the M15x1 thread pitch
Ruger Mini uses 9/16x24 thread pitch
Steyr Aug uses the M13x1 LH thread pitch
7.62mm (.308) - And most ".30 caliber" cartridges
5/8x24 is by far the most common threading for 7.62mm/.308 weapons, but here are a few exceptions:
Accuracy International uses the M18x1.5 thread pitch
Sako TRG uses the M18x1 thread pitch
FN SCAR 17 uses 5/8x24 thread pitch
AK-47s use a number of different thread pitches
The most common thread pitch for eastern European and most US made weapons is M14x1 LH
5/8x24 is the most common thread for .338LM firearms. A few exceptions are:
Accuracy International uses the M18x1.5 thread pitch
Barrett MRAD uses the 3/4x24 thread pitch
Desert Tactical Arms uses the 3/4x24 thread pitch
Nemo Omen (.300 Win Mag) uses the 5/8x24 thread pitch
Sako TRG uses the M18x1 thread pitch
For AK’s, there are two thread pitches that are used most commonly. AK’s are unique in that these rifles are threaded on the gas/sight block, not the barrel:
M24x1.5 RH - This thread pitch is most often found on the gas/front sight block of AK-74 rifles
M26x1.5 LH - A somewhat unique pitch that can be found on PAP92 or M85 Yugo builds
For 50 cal firearms, it largely depends on the manufacturer, but two thread pitches used more often than others:
Armalite AR50 uses the 1” x 14 TPI
Barrett uses the ⅞” x 14 TPI
EDM uses the ⅞” x 14 TPI
McMillian TAC-50 uses the 1” x 14 TPI
We’ve just given you a comprehensive list of common thread pitches, but we always recommend checking with the manufacturer of whatever you’re trying to suppress. Check twice, buy once!
Note: This post was originally published September 16, 2011, and has been updated for freshness and comprehensiveness.
Is the size determined by barrel diameter? Is there a chart or reference for thread options by barrel diameter? Looking to get some of my rifles supressor ready and would rather have as few adapters as necessary. Ideally, they could all be the same thread but I don't think that is possible.
Is there any harm in specifying a certain thread pitch when getting a barrel threaded? Could I make my 9mm carbine the same thread pitch as my 9mm pistol, for instance? The pistol barrel is already threaded.
To get a true, concentric thread on your barrel muzzle, it should be cut on a lathe. Which probably means a complete tear-down (barrel removal). A die-cut threading job is ok but they are consistently a little out-of-square with the bore. If it's too bad you'll have to re-bob the bbl and rethread again. Good luck.
Sir what would be the right thread and pitch for a Hi point 995TS 9mm carbine? Coz I need to buy a muzzle device(thread protector/muzzle brake) thats fairly affordable to permanently pin and weld on it coz NJ doesn't allow it, thank you.
To my knowledge, all CZ 457's ship with the 1/2x20 threads. We sell an adapter to change that into the standard 1/2x28. There are a few new models of 457 now and they may be putting 1/2x28 threads on a few. Regardless, we have the adapter if you need it!
Eric, that will depend on the barrel diameter. If you have a thin "pencil" barrel, you may need to run something as small as 1/2x28 or 9/16x24 instead of the "normal" 5/8x24. I would definitely recommend you take it somewhere with a proper lathe (unless you have your own and are a competent operator) to get a solid 90 degree shoulder... I would not recommend doing it with a hand tap set :)
1/2x28... I just got one from Eagle myself after someone in these comments let me know that they were making a threaded version now. People may thumb their noses at Bersa, but I've always had a soft spot for that little Thunder 380.
Tough to say without a little more info on your rifle Lou. I would give 'ol Green a call and ask them: 1-800-243-9700. Have your serial number handy when you call in the event they changed threads on that rifle at some point.
First off, nice find and I'm a little jealous. Cool rifle. The PTR91's all ran a metric m15x1RH (not Left Hand) thread pitch. Pretty sure they all ran closed tine flash hiders but some later models may have used a compensated flash hider like an A2 Birdcage... Though I may be making that up. Regardless, there are many muzzle devices out there (both brake and hider) in m15x1RH.
In the UK most. 22rf barrels are threaded 1/2" x20 UNF
Blaser are now using M15x1 on their standard weight 17mm barrels, M17x1 on their 19mm semi weight barrels and M18x1 on their 22mm match weight barrels.
Not really, but there are a few ways to get your current barrel threaded and use an adapter. The fine folks over at Tornado Technologies have been doing just that for a while and I never hesitate to point our customer's their way.
They do good work. Here is a link to the different Walther threadings they do but may be worth a call as well www.tornado-technologies.com/category/WALT/Walther/1.html
Leonard, I didn't even know Bersa launched a threaded model this year! I called their parent company and the guy on the phone said it was 1/2x28 but I haven't actually put hands on one to tell you with any first hand confidence.
Couple of answers to that. The 223 brake will certainly thread onto a 1/2x28 9mm barrel BUT you need to make sure the bore aperture will actually fit a 9mm round through it. Some manufacturers have a "loose tolerance" that allow a .30 caliber projectile to fit through their 1/2x28 brakes, but MOST do not.
I have an omega mp5 clone that omega claims on there website has a 1/2 x28 threaded barrel however it has a left hand thread pitch. I cant seem to find anyone who makes a a 1/2x 28lh thread protector. So i am thinking maybe omega is wrong and it is a 13.5x1lh thread. Does anyone know if there is such a thing as a lh 1/2 x 28lh barrel thread or is mine metric?
Hi guys does anyone know where I could get a M14 RH female to 1/2x28 male adapter. I have a German made Oberland arms ar15 platform rifle and there are very few muzzle brakes to suit this thread. They would need to send international as I'm in the U.K. Cheers for any info!
I have a .243 rifle threaded with M18x1, also I have a CX4 Storm unthreaded in 9mm. What thread adapter do I need in order to buy only one silencer that fits both guns.
The main idea it to buy only one silencer, i can buy an adapeter for both guns but need to know wwhich.
I would suggest the Griffin Optimus since it can do both of those calibers plus more. They have adapters that will work with that silencer and those thread pitches. The Optimus is great because it performs well as a rifle silencer or pistol silencer.
Trying to research and learn about suppressors, so if I purchase a suppressor for a 308 with a 5/8x24 and I also want it to fit a colt ar15 with a 1/2x24 all I need is a adaptor and the muzzle brake from the same manufacture as the suppressor, my goal is to make my ar 223 more enjoyable to shoot and use possibly both rifles to cull down the coyotes we have on our hunting club. I haven't bought the 308 yet, looking at the mossberg MVP LC though, I think it already comes with your trifecta muzzle that would adapt to your suppressor now? Could it just be a muzzle brake for the 1/2x24 on the ar and it be ready for the suppressor like the 308? The $$$ are beginning to roll up quick, but these coyotes have to go. Thanks, Kenny
Actually this is one of the areas where there is not an industry standard. Some of them are 1/2Ã—28 some are 1/2Ã—36 and some are even 5/8Ã—24. There is a wide range in 9mm carbine barrels so be sure and check with the manufacturer.
Hello I have a savage arms 64f .22LR and I'm just taking a shot in the dark here but I'm going to assume that in order to put threads onto it it will have to be 1/2x28 correct? Now I'm just wondering would it not be able to make 14x1 threads on to the barrel? Sorry for this it's my first rifle I have owned and I just want to make it so I can put threads onto the end.
I would suggest having it threaded 1/2Ã—28 and then you wouldnâ€™t have to use and adapter. If there isnâ€™t enough barrel diameter for that then you could thread it and put an adapter to get to 1/2Ã—28. You can thread just about any barrel profile out there.
Smith and Wesson Model 422, a .22LR pistol, has some really odd thread. It mics 8.52 mm and has a pitch of 48 TPI, so it is something inches, but doesn't seem to meet any standard. Is there some actual data what it might be?
I wouldn't use them the prices are ridiculous. The threading is more than a threaded barrel from a lot of the companies. I checked for CZ 75. CZ sells the threaded barrel but it's black, and they sell the same length non-threaded in stainless color so it's plain carbon steel, if I wanted that color I would have to get it threaded, so by Tornado price that's like over 300 when CZ sells the Black version for like 150 and you could polish it yourself or have it polished cheaper than $160.
Recommendations are nice but that companies website doesn't even work when you click on products, it's unclear to find stuff and the prices are like Versace or something, are we in Europe, screw don't use a companies that rips you off.
EFK is okay prices they just don't offer a lot of options. Tornado bad, EFK good.
The reason that Tornado Technologies is more expensive is becasue they have to have to extend and thread the barrel. A factory barrel will be less expensive for sure. We have never had any issues with them.
I bought a Czechoslovakian VZ 52 in 7.62 X 45 made in 1952. To my surprise, it has a threaded barrel with a thread protector. How can I determine what size adapter and what silencer would be appropriate if I were inclined to buy one?
Ok so I brought a fake suppressor thatâ€™s for 7.62 x39 and 9mm .. the thread on the fake suppressor is 1/2Ã—36 and the thread on my ak is 14-1 lh . Before I fabricate this item to fit length wise on my barrel will it be ok to use it as far as the thread set up goes ?
I canâ€™t speak for the Walther family of .32 pistols. However, the CZ vz. 61 (â€œmodelâ€ 61) Skorpion machinepistol used metric 12Ã—1 on the barrels that were threaded (most were not). Perhaps this is common for European .32 calibre (7.65mm) barrels of that era and would be a strong possibility for the PP/PPK.
Quick question about threads. I currently own a CZ Scorpion (Since around December 2015) and am currently piece-mealing it together to bring it to 922R compliance. Obviously it came with a "muzzle break" but since that is one of the parts I need to swap out, I purchased an American made muzzle break as part of a kit. I cant seem to get the American made muzzle break to thread correctly. Does anyone know if CZ (CZ-USA specifically) changed the thread pitch (?) for the newer models? Or am I missing something here?
I'm not 100% percent sure, but I believe that Galil rifles in 5.56 use a M13x1 RH thread because on CNC Warrior's shop in the M13x1 RH section, they have a muzzle brake they state is for "Galil variants". I'm not sure if that applies to the ACE series or not, however.
Im looking to buy a spiked muzzel break like they have on a lot of ARs and Shotguns for my xdm 9 4.5" with threaded barrel. My gun has a .5x28 barrel, could i put a .5x28 designed for .556 or would that just blow up in my face. Also yes I realize this might look sort of ridiculous, thats kind of the point.
I just bought a gen 3 glock 19 TB, what would be the best suppressor for that 13x5 LH barrel?
Also, would an HK thread protector work on that barrel?
Thank guys, new to the suppression game and I'm stoked!
I've got a Springfield XDM 5.25" and a Kahr PM9 and i want to get my existing barrels threaded so that the barrels do not extend past the front of the slide. Is that something you can do? i'd like use the AAC silencer i bought from you guys on both of my pistols when target shooting.
Unfortunately the barrels have to be threaded and extended to attach a silencer. The slide will interfere with the barrel and silencer if it is threaded at its current length. Tornado Technologies might be able to thread and extend your existing barrels. We do not offer any gun smithing services at our shop but can recommend some in our area.
Sig offers 2 different threads for their P226 9mm barrell. The common 13.5x1 and a 126mm. I'm interested in the 126mm barrel because of the coating on it but can't find a single adapter or piston that fits that. Can someone tell me more about that threading? Thanks.
There are 2 common thread pitches for 9mm handguns 13.5x1LH and 1/2Ã—28. In the case of this barrel I would contact SIG and ask the thread pitch. My assumption is that it is 13.5Ã—1 since most SIG barrels are that thread pitch. Keep us updated when you find out. Thanks
I just read this comment and it looks like there may be some confusion about 126mm being the thread pitch.
The 126mm youâ€™re reading about is the barrel length of the barrel thatâ€™s threaded using the M13.5LH thread pitch. In other words, it isnâ€™t a thread pitch at all. If you have questions about that, please donâ€™t hesitate to contact us.
I have an old 1907 savage .32 that has been in my family since 1930. I had an idea awhile back to find someone to make an extended threaded barrel for it so i could add a really cool silencer or whatever to it. But finding someone to make such a thing is like pulling teeth. Now i know it's not a glock sig beretta 1911 clone or whatever but it certainly is'nt a cheap piece of crap or a foreign pistol . For god sakes my grandad carried with him into ww2. If anyone here knows anyone that might be interested in or knows how to make a pistol barrel that is threaded for this still excellent shooting pistol which is by the way entirely AMERICAN made please email me at firstname.lastname@example.org.
I mean i am sure that modern equipment could manage to produce a barrel that they made over 80 years ago. And i am sure that if it is a money thing that a run of these would sell with no problem since it appears that every barrelmaker i have talked to just finds the idea absurd and all but flat refuses to do it since the 1911 barrel market is not competitive at all. Sorry to rant but it gets frustrating when you are willing to pay and noone wants the work
Noob here. Great site and thank you for putting all the info together.
I'm new to machining and a friend is going t o help me thread my .22 Airforce Talon. From what I gather, the thread needs to be 1/2 UNF. so I have a couple of questions if someone could please help:
Is it true that this means 1/2 x 28 from figures on this page?
If yes then what does "28" part mean? does it mean 28 turns in one inch?
If not 1/2 x 28 then what is the correct thread?
If someone could tell me how many turns per inch then how many turns need to be threaded and what is the total length of this newly threaded section ( I notice that some part is not threaded towards the barrel side, so what is the length of this unthreaded but 1/2 inch dia section?)
Sorry if I am missing something here but I wanted to be sure before I have the barrel threaded as the friend has never done this before either.
You are correct the 28 refers to threads per inch. Have your barrel threaded 1/2Ã—28 and you will be good to go. If your friend hasnâ€™t done it before I suggest that you take it to a gunsmith that has done it before since the threads have to be precise.
Ah just to add to my last few questions, I read that a "standard" 1/2 inch UNF thread is 20 turns per inch. Here is the link to this:
Another bit of info is that I am first doing this to my Airforce Talon while the plan is to do same to my .22LR later on too. Should there be a difference? and is that what is meant by "28" in 1/2 x 28 as written here on this page??
BarSto makes a .40 barrel for the Sig P229 having an option of M13.5 LH thread. When purchasing an Osprey .40, the only option was to use a 9 mm piston with that thread size. I then opened up the bore on my lathe to accommodate the larger .40 bullet.
Only goof was I was not aware that the Silencerco piston has a recessed O-ring that requires a smooth end on the muzzle of the barrel (at minor thread diameter) to interface with that O-ring. BarSto will thread the barrel that way (I think they refer to that style as "Euro" threads) if you ask. I didn't know to ask so my barrel was threaded all the way to the muzzle. No prob, turned it smooth on the lathe.
What some said was not doable, is very much so - works fine.
To get the .40 for a P229, you have to go through EFK firedragon. They will get you one made. I spent a month trying to look at all my options. Tornado tech wonâ€™t do that barrel. There was only on company I found had anything to do with a threaded .40 sig.