The TSAR-300 is the ONLY 300 AAC ®Blackout® upper which provides the versatility of a short barreled rifle (SBR) upper without the red tape and NFA paperwork. - .30 Cal Suppressors* fit inside the circumference of a permanently attached shroud allowing shooters to attach a suppressor without significantly increasing the overall length of the rifle. - The TSAR-300 is full auto rated with a mil-spec bolt carrier group. Every upper comes with a TacSol two piece free floating XG-PRO handguard and 10rnd magazine. -0 QUICK SPECS: - Weight: 4.4 lbs - Bore Length: 11 - Overall Length: 16.1 - Twist: 1-8 - Threads: 5/8x24 - Maximum Suppressor OD: 1.75 - Minimum Suppressor Length: 6.5 - Gas System: Pistol Length - **INERT SUPPRESSOR NOT INCLUDED WITH UPPER**