UTG Model 4/15 Free Float Carbine Length Quad Rail System
Price 72.95 USD
Fits all Model 4, 15, and 16 rifles * Solid aluminum construction with precise CNC machining * Four Picatinny rails with 15 continuous slots each * Great zero-retention capability for all accessories installed on the rails * Easy installation with no modification to the barrel involved; measures 17.2 by 2.4 by 2.4 inches (L x W x H)