Uploaded July 2016 | Updated September 2026, 7 hours ago
This is the first of a series attempting to push a projectile in excess of MACH 4 aka 4 times the speed of sound. In terms of feet per second MACH 4 is 4500fps. We are using a parts AR15 to test what happens when a 22cal air rifle pellet is loaded in place of a .224 caliber bullet.
Do NOT Under Any Circumstances Attempt This!
This is the first of a series attempting to push a projectile in excess of MACH 4 aka 4 times the speed of sound. In terms of feet per second MACH 4 is 4500fps. We are using a parts AR15 to test what happens when a 22cal air rifle pellet is loaded in place of a .224 caliber bullet.
Do NOT Under Any Circumstances Attempt This!
