AntTech M-Nub Arm for TM NGRS M4/416

Designed for use with R-Hopped barrels, this arm corrects your hop adjustment range and your BB War range. The OEM arm with a flat nub, tends to dramatically overhop when paired with an R-Hopped barrel... speaking from experience! The packaging includes plenty of extra M-Nub material for a customized fit to your specific inner barrel window.