Proof Research Falkor 7even/ MT7 25 Creedmoor Threaded Rifle Barrel Sendero 22 in 7.5 Twist Pxt 5/8-24 Thread 2.13 Weight Carbon. PXT - PROOF Exponential Twist - is a complete rethinking of conventional rifling geometry and twist progression engineered to reduce engraving force minimize throat erosion and create a smoother transition as the projectile engages the rifling. Specifications for Proof Research Falkor 7even/ MT7 25 Creedmoor Threaded Rifle Barrel: Manufacturer: Proof Research Caliber: .25 Creedmoor Barrel Twist Rate: 1-7.5 Firearms Threads Per Inch: 5/8x24 Gun Make: Falkor Gun Model: Falkor Defense MT7 Falkor 7even Gun Type: Rifle Package Contents: Proof Research Falkor 7even/ MT7 25Cm Threaded Rifle Barrel What firearm models does the manufacturer say Proof Research Falkor 7even/ MT7 25 Creedmoor Threaded Rifle Barrel is compatible with? The manufacturer says that Proof Research Falkor 7even/ MT7 25 Creedmoor Threaded Rifle Barrel is compatible with Falkor 7even Falkor Defense MT7Proof Research 156995: Falkor 7even/ MT7 25 Creedmoor Threaded Rifle Barrel Sendero 22 in 7.5 Twist Pxt 5/8-24 Thread 2.13 Weight Carbon