ASG M-lok Rail Long 3pcs

Three accesssory Rails with the M-Lok system allows you to mount grips, sights, lights and all 21mm picatinny rail accessories to any Airsoft gun with the M-Lok system. Ideal for the EVO B.E.T and A1 Carbine versions.

Each rail is 8cm longThe rail is made of ABS and comes in sets of 3

BTW Its definately M-lok, not m-lock. You might be suprised by how many failed searches there are due to this.