Note: Product is in mid inventory change, product may or may NOT have M-Lok slot by the barrel nut at the 3 & 9 a-clock position and may or may NOT come with metal QD insert.
The Geissele Super Modular Rail MK4 (SMR) was designed as an ultra light weight rail system for the M4 Carbine and all mil-spec AR-15 variants. The SMR MK4 was designed to do a good job in meeting the ten design specifications for a good M4 weapon rail with an emphasis on weight reduction.
