Mount a "Bushmaster of a higher caliber" on your existing Lower! The .270 cal. 6.8mm SPC (Special Purpose Cartridge) was developed for the military, but is now available commercially. Velocity averages a bit over 2600 FPS (with Hornady 115 Gr. V-Max), and the heavier bullet weights deliver a terminal energy capable of bringing down larger game.

Specifications and Features:
16" M4 profile barrel
6.8 SPCII chamber to handle all factory 6.8 SPC loads
1:11" rifling twist, 4 groove
M4 feed ramps
4150 barrel steel
Chrome-lined
Carbine gas system
"Izzy" muzzle brake
Includes 26 round magazine