4" Inch Drop-in Replacement Quad Rail AR-15 Pistol Handguard for M4 SBR
4" Inch Drop-in Replacement Quad Rail AR-15 Pistol Handguard for M4 SBR, Precision Machined Out of Premium 6061 Aircraft AluminumAR15/M4/M16 Quad Hand Guard SystemFits Variant PISTOL, and other short models7 Slots On Each RailDrop in installation Length: 4" (130mm)Width: 2.5" (63mm)Height: 2.2" (56mm)Weight: 7oz (325g)