The M4 Carbine Length Drop in Quad Rail is an easy to install upgrade for a basic carbine. Being a two-piece design for easy installation.
Aim Sports AR-15 Carbine-Length Drop-In Quad Rail Handguard
MT021 Aim Sports Carbine Rail System For M4/M16 Airsoft Rifle
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MT021 - Aim Sports M4 Carbine Quad Rail - Black - AR15Discounts
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MT021 - Aim Sports M4 Carbine Quad Rail - Black - AR15Discounts
Handguards & Rails In Stock Gun Parts
AIM Sports Free Float Carbine Length Quad Rail - Ver.3, Accessories & Parts, External Parts, M4 / M16 External Parts, M4/M16 Modular Railed Handguards - Airsoft Superstore
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Aim Sports MT041 Stanag Drop-In Quad Rail AR-15/M16/M4 Aluminum Black Anodized: B Tactical Shop: B Tactical
AIM SPORTS INC - SPORTS MT021 M4 HANDGUARD
AIM Sports Multi-Level Z-Type Carry Handle M4 / M16 AEG Rail Mount
Aim Sports Handguard - Drop-In Quad Rail - M4 Carbine (MT021)
AIM SPORTS INC - SPORTS MT021 M4 HANDGUARD
AIM Sports Airsoft Megastore