Muzzle brake

[oogenshire]

just picked up a sig cross in 6.5 creedmoor, got out to the range yesterday and realized it really needs a muzzle brake. barrell is threaded in 5/8 -24 shouldered. what does the shouldered mean? also the factory threads on the barrel feel really rough like they cut them and didnt bother doing any finishing work on them its wierd for the fit and finish for the rest of the rifle to be where it is and the barrel threads to have burrs all over

 

[talvare]

This is only a guess on my part, but I'd say that the term "shouldered" would mean that when the muzzle brake is threaded on until it butts against the shoulder on the barrel, it will be properly indexed so that the ports on the brake are oriented in the proper direction.

Ted

 

[pontiac428]

I would not be surprised if the muzzle threads were done after the barrels were finished as an afterthought to meet demand. An accurate rifle has a full 11 degree crown, full stop. But the same trend that makes 6.5 a popular caliber calls for muzzle devices and suppressor compatibility. So Sig responded. You can burnish the threads a bit in the lathe with some maroon scotchbrite to take the sharp bits down but go easy, retaining the fit is more important than smooth threads.

 

[woodchucker]

I would not be surprised if the muzzle threads were done after the barrels were finished as an afterthought to meet demand. An accurate rifle has a full 11 degree crown, full stop. But the same trend that makes 6.5 a popular caliber calls for muzzle devices and suppressor compatibility. So Sig responded. You can burnish the threads a bit in the lathe with some maroon scotchbrite to take the sharp bits down but go easy, retaining the fit is more important than smooth threads.

The burrs can be handy, they help hold the muzzle tight from backing off from (shooting vibration). Don't know, just throwing it out there.

 

[mmcmdl]

My home made tapered brake got shot down field once again up at camp . A blued in taper and Loctite retaining fluid didn't work . I don't want the barrel threaded as I want it as it came from the Remington Factory up in Illion near camp . Guess I'll put up with the pain the .338 WinMag can deal out . (it's a lot )

 

[machPete99]

Note that some of the Sig products use an odd angled shoulder, and the muzzle attachment needs to match.

 

[tobnpr]

^^^
This.
Most muzzles have a shoulder that's 90 degrees to the bore, same as you have a 90 degree shoulder at the barrel tenon to seat against the receiver ring. Sig has a 25 degree taper for their proprietary muzzle devices.

 

[oogenshire]

^^^
This.
Most muzzles have a shoulder that's 90 degrees to the bore, same as you have a 90 degree shoulder at the barrel tenon to seat against the receiver ring. Sig has a 25 degree taper for their proprietary muzzle devices.

well the only proprietary devices i can find in their store i cannot get in illinois (yet...) i dont see brakes listed anywhere, looks like i get to learn some new skills! ty for the information

 

[mfendley]

On my brakes, there is a thin nut that threads on first, then you thread on the brake as far as you can while still ensuring that the brake is clock in the right orientation. Then reverse the thin nut you installed previously to lock the brake in to position.

 

[BWS Arms]

^^^
This.
Most muzzles have a shoulder that's 90 degrees to the bore, same as you have a 90 degree shoulder at the barrel tenon to seat against the receiver ring. Sig has a 25 degree taper for their proprietary muzzle devices.

Yep. The Sigs have a taper behind the threads.