A Revolutionary Technology

No barrel bore is perfectly centered, and even high-precision barrels have machining imperfections that may go unnoticed when the gun is cool. But firing just a few rounds causes the barrel to heat up enough that these minor imperfections can have a significant impact on accuracy. During firing the resulting pressure wave causes the barrel to expand, flex and bow. The hotter it gets, the worse it gets.

Upper Receiver Group 1 (URG1) Sine Pari Series

The patented StraightJacket® Barrel System is the only thermal management technology that quickly conducts heat away from the barrel, keeping it cool and dimensionally stable, and ensuring the gun stays accurate even after 30 rounds of continuous fire.

Rapid heat dissipation is only part of the solution. The patent pending Muzzle Recoil Compensator (MRC™) uses the waste propellant gases to virtually eliminate recoil and provide stability, keeping the rifle on target.

TTI created and built what is being called the finest production upper receiver group on the market today. The Sine Pari Series Upper Receiver Group is designed for serious shooting enthusiasts and professionals who demand unmatched repeatable accuracy and reliability in their weapon system. At the very core of the URG is the StraightJacket® Barrel System GEN IV. This revolutionary system uses advanced engineering principles, construction and materials to increase the structural rigidity and reduce peak temperature variations of the barrel resulting in a significant reduction of differential barrel expansion and associated inaccuracy. (Click HERE for more information and specifications)


First, the StraightJacket® Significantly Reduces Barrel Whip

By utilizing a light-weight composite barrel construction the StraightJacket® drastically reduces the barrel whip that has such an adverse effect on accuracy. A conventional rifle barrel is a dynamic pressure vessel, required to be rigid enough to send a fired projectile through stable flight while at the same time remaining flexible enough to not rupture upon firing. By pressure fitting a thin-walled machine tube onto a barrel core, and then filling the void with our proprietary media, the resulting new monolithic structure adds accuracy-enhancing rigidity while retaining necessary flexibility.

Second, the StraightJacket® System Drastically Reduces Heat

As we all know, the greatest enemy to accuracy is heat. The StraightJacket® reduces heat caused by firing, keeping the internal chamber and bore temperature very low. Conventional barrels increase in temperature from one shot to the next, causing manufacturing tolerances to play an even greater role. It is impossible to manufacture a barrel with a perfectly centered bore. The very best barrels have tighter tolerances, but the cutting bit still waivers off center, causing varied wall thickness. As the barrel gets hot from firing, the small variations in thickness cause the barrel to expand unevenly. This expansion causes varied resistance and inconsistent velocities. Our proprietary media wicks the heat away from the center barrel towards the thin walled outer jacket, which more rapidly dissipates heat because of its larger surface area. It also means that what used to be your best 3 shot group can now be your average 10 shot group.

Third, the StraightJacket® delivers an outstanding reduction in recoil

The StraightJacket® includes our Muzzle Recoil Compensator (MRC™), which practically eliminates recoil by redirecting the propellant gases out and away from the shooter to provide you with a more comfortable shooting environment.

Last but not least the StraightJacket® Barrel System will extend the life of your barrel

By reducing heat and controlling the pressure wave throughout the barrel, we are able to dramatically extend the life of your barrel.

We have spent more than five years testing and perfecting this system.


Rifle Accuracy Facts, Harold R. Vaughn

Applied Ballistics For Long-Range Shooting 2nd Edition, Bryan Litz

Accuracy And Precision For Long Range Shooting, By Bryan Litz

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