*Extends grip space at the front of the kit and features M-LOK slots for attaching various accessories.
*Compatible with AR-15 UPPER HANDGUARD RAILS with widths less than 38mm. (e.g., BRN-180,FM-15, noveske N4) Unsupported JAKL
*Compatible with M4 RIS 0
*Internally accommodates various muzzle devices and suppressors with diameters up to 40mm.