Description
Endeavor 300 MK4 Upper Features The ENDEAVOR line features a 20-inch barrel so that you can easily pair the upper receiver with your existing AR15 lower and squeeze out every drop of ballistic performance from Hornady’s 6mm ARC caliber. Endeavor 300 MK4 Upper Specifications Caliber: 6mm ARC Model: Endeavor 300 Series: MK4 Barrel Length Range: 20″ to 20.99″ Sights: None, Optic Ready Muzzle: CMMG SV Brake Firearm Fit: AR-15 Handguards: 15″ CMMG RML M-LOK Receiver Finish: Black Hard Coat Anodized Receiver Material: 7075 T6 Aluminum Thread Pattern: 5 / 8″-24 tpi Twist: 1:7.50″ Weight: 5.50 lbs Barrel Description: Medium Taper Barrel Finish: Black Nitride Barrel Material: 416R Stainless Steel Barrel Length: 20″
