Endeavor 300 MK4 Upper Features
CMMG’s ENDEAVOR 300 Upper Group Kit is chambered in Hornady’s 6mm ARC. Designed for superior long-range accuracy, this upper group kit features a 20-inch barrel and includes three 10-round magazines so that you can easily pair with your existing AR15 lower receiver and squeeze out every drop of ballistic performance from this exciting new 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
- Capacity: 10rd
- Muzzle: CMMG SV Brake
- Firearm Fit: AR-15
- Handguards: 15″ CMMG RML M-LOK
- Includes: 3 Magazines
- 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″
Frequently Asked Questions – CMMG ENDEAVOR 300 MK4 UPPER BLACK 6MM ARC 20" BARREL 10-ROUNDS THREE MAGAZINES
- How fast does this ship?
- Ships in 1‑3 business days to your licensed D.C. FFL dealer after purchase and registration.
- Do I need registration?
- Yes. DC requires firearm registration, including a mandatory 10‑day waiting period after purchase approval from MPD before pickup. Handguns require registration, magazines <=10 rounds.
- Is this legal in D.C.?
- Yes, provided it complies with D.C. law (registered, no assault features, magazine ≤10 rounds).
- Is the CMMG ENDEAVOR 300 MK4 UPPER BLACK 6MM ARC 20" BARREL 10-ROUNDS THREE MAGAZINES suitable for me?
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