The vk-1 rifle uses a patented low-profile piston system design featuring optimum gas port sizing and an advanced piston assembly.This features a unique cup and spigot design that improves the gas seal and overall efficiency of the gas system.The vk-1 includes a staged gas bleed system that allows the rifle to operate consistently, either suppressed or unsuppressed, with varying types of factory ammo.Features radian weapons raptor charging handle; talon selector;ambi controls; continuous 12 o'clock picatinny rail; thermal fit forged upper receiver; patented vk-1 piston system; a2 flash hider; magpul moe sl buttstock and k2 grip; magpul moe enhanced trigger guards; low profile m-lok handguard and machined cooling flutes.Caliber: 5.56mmBarrel Length: 16"Capacity: 30+1Oal: 31.90"-34.50"Weight: 6.80 lbsStock Description: Magpul MOE SL ButtstockMuzzle: A2 Flash HiderReceiver Material: SteelSights: Picatinny RailBarrel Description: Steel ThreadedBarrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: AmbidextrousStock Finish Group: Black