Geissele Automatics, MK4, Super Modular Rail, Handguard, 10.5, M-LOK, Barrel Nut Wrench Sold Separately (GEI-02-243), Gas Block Not Included, Black
- Full-length picatinny rail with additional forward-mounted picatinny rail
- M-LOK attachment points in the 3 6 and 9 o'clock positions
- Venting in the lower 45° quadrants
- Geissele proprietary 2.25 barrel nut
