20 inch AR-15 6.5 Grendel M-LOK Stainless Complete Upper Kit

80% of 100
Special Price $409.99 Regular Price $579.99
In stock

Why Buy From Us?


Don't see the exact configuration you want? No problem, just let us know. Most of the time we can customize with the parts we have just to your liking.


All our uppers have a Lifetime Warranty to the original purchaser. Some conditions apply - click here for details.

Customer Service

We believe in customer service before and after the sale. We never take days or weeks to respond. Most of time if you email or leave a message, we usually respond the same day or next business day.

Turnaround Time

We usually take only 2-3 business days to build and test your upper before shipping it. We never take weeks to ship your upper. Accessories ship even faster. Check the live status update on the banner at our homepage for current wait times.


We always specify the manufacturer of the major components therefore you know what you are getting. We only use made in America components from quality manufacturers.


AR-15 Milspec (Matrix Arms, Anderson Mfg, Aero Precision, PSA, etc) 7075 T6 Aluminum Stripped Upper Receiver w/M4 feed ramps - Forward Assist and Ejection Port Door installed
BCA 20 inch 6.5 Grendel Rifle Length 1/8 Twist 416R Stainless Steel Heavy Barrel
Low profile Nitride STEEL gas block
Stainless Steel Rifle length Gas tube
Guntec USA 15 inch M-LOK Slim lightweight Rail 
Standard 5/8-24 A2 Flash Hider and crush washer
Toolcraft 6.5 Grendel Type II Nitride Full Auto BCG and charging handle
Unbranded AR ELG AR-15 Lower Parts Kit
Rogers Super Stock Kit
*Optional*: Upgrade to an Adjustable Gas Block
*Optional*: Upgrade to a Black or Stainless Competition Muzzle Brake
*Optional*: Change to a Magpul FDE Receiver and 15 inch Handguard (See Pictures for example) (choose from options above)

All parts are MADE IN THE USA.

BCA makes very high quality barrels. Made out of premium 416R Stainless Steel for enhanced corrosion resistance and accuracy. 

The Guntec rail is very high quality and comparable to many other higher end rails that cost 2x or 3x as much. Handguard is lightweight, made from high quality 6061 aluminum and mounting system is rock solid.

Gas Block diameter is 0.750 and is made out of steel (not aluminum).

*Optional* - Upgrade to an Adjustable Gas Block. Great option if you are using a suppressor or just want to fine tune your system.

*Optional* - Like a Magpul FDE colored receiver and hanguard instead? We now offer an Aero Precision Upper Receiver and 15 inch Guntec Keymod Rail in Magpul FDE color (see pictures) - choose from options above.

*Optional* - Upgrade to a Black or Stainless Competition Muzzle Brake. This is an enhanced version of the popular style muzzle brakes. The baffles and ports are milled larger to drive pressure up and to keep the muzzle down more effectively.

More Information
FDE Color Magpul FDE Receiver & Handguard
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