I have a WCA SG551 and wondering if any firm offers a blast forward device for the muzzle? I may file a Form 1 and SBR it using a real Swiss 551 upper... in which case muzzle blast may become even more pronounced so would appreciate it if anyone has used such on a 55X, what that might be?

The Diameter of a factory SIG 55x flashider is 22mm. That´s a STANAG size. What will fit a standard AR flashider will work on a SIG flashider as well.

Do you mean a linear comp or something to mount on the flashhider?

A linear comp would probably be more size efficient and will fit on the 1/2x28 threads on US made sig barrels.

quote:

Originally posted by Dakor:
I may file a Form 1 and SBR it using a real Swiss 551 upper...

You might want to re-think that plan. Its not an AR-15.

you mean like this?
https://www.kawvalleyprecision...p/kvp-linear-blk.htm

quote:

Originally posted by Dakor:
I may file a Form 1 and SBR it using a real Swiss 551 upper... in which case muzzle blast may become even more pronounced so would appreciate it if anyone has used such on a 55X, what that might be?

Two problems with this:
1. The upper receiver is the serialized controlled firearm of the 55x.
2. The Swiss 551 has an integrally machined non-removable flash hider.

The blast of the 551 short barrel is not bad at all. A linear Comp is a waste of money and will look silly on your sbr wca 551. Your money, your rifle but I wouldn't do it. You could add a SF or SiCo suppressor mount and use the respective blast divertor. Or use a Noveske PIG. The SF and SiCo muzzle devices will preclude removal of the gas tube without removal of the muzzle device, while the PIG will likely not allow removal of the gas tube or piston. Also, the PIG will increase back pressure in an already overgassed rifle.


If you want a Swiss 551 sbr I recommend you sell your WCA 551 on Gunbroker and buy one of the JDI import 551 pistols.