The bolt carrier on the Revolution (CMR), Revolution DI, and Rogue, requires a longer stroke in order to clear the longer .308 cartridges and/or spent cases.
Because of this, these firearm models use a proprietary (longer) buffer tube as well as a proprietary buffer spring.
STANDARD LENGTH AR15/M16 CARBINE BUFFER TUBES (RECEIVER EXTENSIONS), AND BUFFER/ACTION SPRINGS WILL NOT WORK IN THE REVOLUTION, REVOLUTION DI, OR ROGUE MODELS.
DO NOT USE THEM, THEY WILL NOT WORK, AND YOU MAY DAMAGE YOUR FIREARM.
Download/view the file below for a visual representation of the correct buffer tube and spring to use in case you aren't sure.