Colt Sp1 threading

jclayto · April 4, 2011, 10:34 PM

I asked this over in Rifle last week with 0 response. Perhaps you folks could answer my question?

My 1975 SP1 has a factory threaded barrel and flash hider.

If in the future I decided to pursue a suppressor for this rifle, does anyone know if the factory threading is the right pitch for most common 5.56 suppressors?

PTK · April 4, 2011, 10:41 PM

1/2-28.

jclayto · April 5, 2011, 06:31 PM

Thank you.. not being at all familiar with suppressors, is that a pretty common thread pattern?

PTK · April 6, 2011, 11:31 AM

Exceedingly common. You'll have no issue with finding what you want.

April 4, 2011, 10:34 PM	#1
jclayto Senior Member Join Date: February 14, 2005 Location: Anderson, SC Posts: 520	Colt Sp1 threading I asked this over in Rifle last week with 0 response. Perhaps you folks could answer my question? My 1975 SP1 has a factory threaded barrel and flash hider. If in the future I decided to pursue a suppressor for this rifle, does anyone know if the factory threading is the right pitch for most common 5.56 suppressors?

April 4, 2011, 10:41 PM	#2
PTK Senior Member Join Date: March 20, 2008 Posts: 441	1/2-28.

April 5, 2011, 06:31 PM	#3
jclayto Senior Member Join Date: February 14, 2005 Location: Anderson, SC Posts: 520	Thank you.. not being at all familiar with suppressors, is that a pretty common thread pattern?

April 6, 2011, 11:31 AM	#4
PTK Senior Member Join Date: March 20, 2008 Posts: 441	Exceedingly common. You'll have no issue with finding what you want.