Tisas B9R 4.25" Gen 2 Basilisk Compensator Thumb Rest Mk2

The Underworld Arms Basilisk Compensator for the Gen 2 Tisas B9R Carry 4.25" DS 1911, is a frame mounted compensator with two large expansion chambers that redirect the gas flow into two large top ports and four angled side ports which dramatically reduces muzzle flip and felt recoil. 

The compensator is compatible with the second generation B9R with bull barrel, it is not compatible with the first generation B9R that has a bushing barrel. 

This 50 state legal compensator is made for unthreaded barrels and is anodized black. This compensator has an ambi thumb rest lower with horizontal serrations that match the horizontal serrations on the slide release and thumb safety for a cohesive aesthetic. The holster we make is compatible with this thumb rest lower. 

On most builds this compensator will require recoil spring tuning and we offer a spring tuning kit if your build requires it. 

Compatible holsters are available HERE

This compensator increases the dimensions of the firearm so it requires a dedicated holster such as the ones we make, or a universal holster such as the MSP Tier 1, and the blackhawk omnivore light bearing. 

Installation Video: Click Here

Everything you will need for the install is included: locking block, screws, Blue Vibratite 121 thread locker, and an allen key. 

Specifications

Material: 7075-T6 

Weight: 2.7oz

Length Overall: 3.75"

Length Added to Firearm: .825"