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3/14/2012 9:13:57 AM EDT
Is it safe to say most AR have the same thread pitch? Isn't it 1/4 something?

Edit, muzzle for surpresor
3/14/2012 9:19:19 AM EDT
[#1]
Quoted:
Is it safe to say most AR have the same thread pitch? Isn't it 1/4 something

Depends on which fastener ?
(grip, muzzle, receiver extension, etc)
3/14/2012 9:20:16 AM EDT
[#2]
almost all 5.56/.223 and .22lr models are 1/2 x28 tpi.  Most 9mm are 1/2 x 36 tpi along with some 7.62x39's, and then 7.62's are 5/8x24 i believe.

ETA: if talking about muzzle threading.
3/14/2012 10:01:34 AM EDT
[#3]
Quoted:
almost all 5.56/.223 and .22lr models are 1/2 x28 tpi.  Most 9mm are 1/2 x 36 tpi along with some 7.62x39's, and then 7.62's are 5/8x24 i believe.

ETA: if talking about muzzle threading.


Yeah, I'm trying to buy 2 flash hiders to fit 1 silencer. Don't want the buy the wrong thread.
3/14/2012 10:13:47 AM EDT
[#4]
Quoted:
almost all 5.56/.223 and .22lr models are 1/2 x28 tpi.  Most 9mm are 1/2 x 36 tpi along with some 7.62x39's, and then 7.62's are 5/8x24 i believe.

ETA: if talking about muzzle threading.


I thought 9mm was 1/2x28 too?  My A2 flash hider screwed right onto my M&P9's threaded barrel...

Don't ask why, I just decided to screw it on
3/14/2012 10:48:18 AM EDT
[#5]
Quoted:
Quoted:
almost all 5.56/.223 and .22lr models are 1/2 x28 tpi.  Most 9mm are 1/2 x 36 tpi along with some 7.62x39's, and then 7.62's are 5/8x24 i believe.

ETA: if talking about muzzle threading.


I thought 9mm was 1/2x28 too?  My A2 flash hider screwed right onto my M&P9's threaded barrel...

Don't ask why, I just decided to screw it on

Seems like there is no real standard.
It varies by caliber from mfr. to mfr.

1/2 x 36 is common for 9mm to keep people from threading a 5.56 FH onto a 9mm.
AA's barrels for 6.5 are 9/16 x 24
30 cal class is usually 5/8 x 24

Then there's some odd balls like 6.5 Sporter which is 1/2 x 36

Verify the threading on your barrel and make sure that your chosen muzzle device is compatible with your caliber.


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