Yankee Hill Machine Company Black Diamond Carbine XL Features The Yankee Hill Machine Company Black Diamond Carbine XL runs a semi auto action chambered in 6.8mm SPC a modern centerfire cartridge chosen for its combination of flat trajectory and solid downrange energy. The 16 inch barrel carries a 1:10 twist tuned to the cartridge's bullet weights and as a carbine length rifle it strikes a practical balance between maneuverability and the ballistic performance a longer barrel provides. The YHM Diamond series 4-side position-marked free-float handguard bridges the gap with the upper receiver giving shooters a stable mounting platform for accessories along its length. For range shooters and home defense users who want reliable follow-up shots in a flat-shooting caliber the Black Diamond Carbine XL's barrel and handguard deliver. Forged 7075-T6 aluminum makes up both the YHM lower and the "T"-marked flat-top upper receiver giving the carbine a durable foundation built to established AR-pattern tolerances. YHM forearm-mounted flip-up front and rear sights come standard giving shooters a folding go-to-ready sighting system that stays out of the way until needed. Feeding from a 25-round magazine the Black Diamond Carbine XL gives shooters a generous ammunition supply before a reload is needed well suited to range sessions where extended strings of fire are common as well as to home defense roles. The carbine's XL designation points to an extended handling platform that still keeps the rifle manageable for most shooters. This Yankee Hill Machine Company Black Diamond Carbine XL in 6.8mm SPC is a strong option for shooters wanting a modern semi auto rifle for sale at GrabAGun. Yankee Hill Machine Company Black Diamond Carbine XL Specifications Manufacturer: Yankee Hill Machine Company Model: Black Diamond Carbine XL Action: Semi-Automatic Caliber: 6.8mm SPC Capacity: 25 Rounds Barrel Length: 16 Rate of Twist: 1:10 Handguard: YHM Diamond Series 4-Side Free-Float Sights: YHM Forearm-Mounted Flip-Up Front and Rear Receiver: Forged 7075-T6 Aluminum T-Marked Flat-Top Upper Available At: GrabAGun