best barrel threads

vivalesteel · January 21, 2011, 07:57 AM

im threading my barrel for a suppreser. I will be making both treads male and female i have about .750'' distance on the barrel to thread and i would like to make only 4 or 5 turns before its tight. im not shure my lathe will cut this and i dont know if there is a tap and die made to get me close to this. thanks

guncrank · January 21, 2011, 08:31 AM

I guess you know all the legal areas for suppressive where you are at.
Please don't think this as negative but if you don't know about your lathe , you should practice on scrap first.
The standard threads for suppressor that I have threaded for have been one half and five eights fine thread.
What ever size you use it must be concentric and parrall with the bore or you will get baffle strikes at worst or end strikes at least.
It would best to indicate bore with a tight fitting gauge pin in a four jaw and a spider.
Just getting a tap and die and trying to thread a barrel and can by hand, well that will get you a baffle strike in a flash , if it us not aligned right.
I have threaded AKs with a die but turned a custom bore guide.
CEW

vivalesteel · January 21, 2011, 04:07 PM

yes i have filled out my form 1 (SBR) had it signed by my sherif and sent all the needed info and $200.00 to ATF. Tryed a few differnt threads on scrap im not shure what thread i will use (labels are old and faded) i gess it doesnt matter as long as its centered on the bore and stops in the same place. Thanks

guncrank · January 21, 2011, 09:57 PM

1/2-28 is standard for AR rifles
5/8-24 for .308 AR

Gunplummer · January 22, 2011, 11:04 AM

gunkrank is right, go with fine threads. If you use a course thread the suppressor will not lock as well and will give you problems by loosening up while firing.

guf · January 22, 2011, 10:59 PM

double start threads and lock with a dogpoint set screw ?

January 21, 2011, 07:57 AM	#1
vivalesteel Junior Member Join Date: December 9, 2010 Posts: 2	best barrel threads im threading my barrel for a suppreser. I will be making both treads male and female i have about .750'' distance on the barrel to thread and i would like to make only 4 or 5 turns before its tight. im not shure my lathe will cut this and i dont know if there is a tap and die made to get me close to this. thanks

January 21, 2011, 08:31 AM	#2
guncrank Senior Member Join Date: July 15, 2006 Location: Fern Creek ,KY and Metro Louisville at large Posts: 430	I guess you know all the legal areas for suppressive where you are at. Please don't think this as negative but if you don't know about your lathe , you should practice on scrap first. The standard threads for suppressor that I have threaded for have been one half and five eights fine thread. What ever size you use it must be concentric and parrall with the bore or you will get baffle strikes at worst or end strikes at least. It would best to indicate bore with a tight fitting gauge pin in a four jaw and a spider. Just getting a tap and die and trying to thread a barrel and can by hand, well that will get you a baffle strike in a flash , if it us not aligned right. I have threaded AKs with a die but turned a custom bore guide. CEW __________________ Republic Arms and Armaments 07 1-502-231-1118 Machine Shop and Finishing Services to the trade and public

January 21, 2011, 09:57 PM	#4
guncrank Senior Member Join Date: July 15, 2006 Location: Fern Creek ,KY and Metro Louisville at large Posts: 430	1/2-28 is standard for AR rifles 5/8-24 for .308 AR __________________ Republic Arms and Armaments 07 1-502-231-1118 Machine Shop and Finishing Services to the trade and public

January 22, 2011, 10:59 PM	#6
guf Member Join Date: May 25, 2010 Posts: 41	suppressor thds. double start threads and lock with a dogpoint set screw ?

January 21, 2011, 04:07 PM	#3
vivalesteel Junior Member Join Date: December 9, 2010 Posts: 2	yes i have filled out my form 1 (SBR) had it signed by my sherif and sent all the needed info and $200.00 to ATF. Tryed a few differnt threads on scrap im not shure what thread i will use (labels are old and faded) i gess it doesnt matter as long as its centered on the bore and stops in the same place. Thanks

January 22, 2011, 11:04 AM	#5
Gunplummer Senior Member Join Date: March 11, 2010 Location: South East Pa. Posts: 3,364	gunkrank is right, go with fine threads. If you use a course thread the suppressor will not lock as well and will give you problems by loosening up while firing.