Firearm : Alexander Arms Tactical 16 carbine with 16.0" barrel Ammunition : 120gr Sierra MatchKing boattail hollowpoint Calibration : all depths are corrected depths The 120 Sierra MatchKing impacted at 2383 ft/sec, penetrated 3.25" before yawing and fragmenting. Block was placed at 100 yards distance from the muzzle. Maximum penetration of the 120 SMK was 19.5", maximum permanent cavity diameter was more than 6" with lesions running to block exterior surfaces. Depth to the maximum permanent cavity was 7.5". Bullet fragmented, with seven large pieces visible within the block. Jacket sections came to rest at 11.75" and 16.25", and the bullet core at 19.5". Brass Fetcher ballistic gelatin testing would like to thank John at http://www.65grendel.com for providing the permission to feature these test results and photographs on the website. We would also like to thank Alexander Arms http://www.alexanderarms.com and Speer http://www.speer-bullets.com for conducting the tests.