Windham weaponry's 450 thumper semi-automatic utilizes a gas impingement system.The flattop upper receiver is forged 7075 t6 aircraft aluminum with an aluminum trigger guard, carpenter 158 steel bolt, and manual lever safety.The receiver is with laser engraved the caliber and has safety indicator markings on both sides.The 450 thumper has a 16" chrome-lined barrel made of 4150 chrome moly vanadium 11595e steel with an a2 flash suppressor.It has a luth-ar buttstock with an adjustable buttplate and cheekrest, ww free-float forend, and hogue over-molded beavertail pistol grip.It includes a (5) round magazine, black web sling, and hard plastic gun case.

Metal Finish: Black Hardcoat Anodized
Action: Semi-Auto
Caliber: 450 Bushmaster
Barrel Length: 16"
Capacity: 5+1
Safety: Lever
Oal: 35.63"
Weight: 7.20 lbs
Stock Description: Fixed Luth-AR with Adjustable Cheek
Muzzle: A2 Flash Suppressor
Receiver Material: 7075 T6 Aluminum
Sights: None, Optic Ready
Barrel Description: 4150 Chrome Moly Vanadium Chrome-Lined
Twist: 1:24"
Barrel Length Range: 16" to 16.99"
Weight Range: 7 lbs to 7.99 lbs
Hand: Right
Stock Finish Group: Black
Metal Finish Group: Blued/Black