Try a heat gun or a map torch. When all else fails take it to a gun smith.
Sig 556 model rifles also use 1/2x28 threads and will be compatible with this SIG SAUER 5.56mm 3-Chambered Compensator.
No, this SIG SAUER 5.56mm 3-Chambered Compensator uses 1/2x28 threads while the Sig 552 uses 14mmx1.0 threads.
Yes, the SIG SAUER 5.56mm 3-Chambered Compensator will fit and function as intended with your Smith and Wesson M&P-15.
Sig Sauer does not provide the dimensions of the SIG SAUER 5.56mm 3-Chambered Compensator. I recommend contacting Sig Sauer for that information.
Sig Sauer does not state how much reduction in recoil the SIG SAUER 5.56mm 3-Chambered Compensator will provide. However, it will reduce the felt recoil of the Sig M400 Tread Pistol.
Yes, the Sig Sauer 5.56mm 3-Chambered Compensator will work for a Sig MCX Virtus in 5.56.
This will be a right handed thread.
Yes, it would work with the Sig M400 VTAC.
The larger cap is a taper cap meant specifically for the M400 Tread to cover the end of the barrel where it starts to taper. It is not necessary for installation on a standard AR-15 barrel. The thinner one is the actual crush washer that you are to use to install on a standard .223/5.56 barrel. Exact torque specs would need to be verified with Sig Sauer if there are no torque specs included with the muzzle device.