16 inch AR-15 NR Side Charging 6.8 SPC II M4 Carbine Upper

Special Price $399.99 Regular Price $529.99
Out of 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.


Gibbz Arms G4 Non Reciprocating Side Charging Upper Receiver with Gen 2 Handle (Gibbz Cam Pin included)
BCA 16 inch 6.8 SPC II Carbine Length 1/10 Twist 4150 CMV Phosphate M4 Profile Barrel
Low profile Nitride STEEL gas block
Stainless Steel Carbine length Gas tube
Guntec USA 12 inch Keymod Slim Profile Free Float Rail
Standard 1/2-36 A2 Flash Hider and crush washer
*Optional*: Add an Azimuth Technology Nitride 6.8 SPC II Full Auto BCG 
*Optional*: Upgrade to an Adjustable Gas Block 

All parts are MADE IN THE USA.

This is a Non Reciprocating Side Charging Upper - keeps the charging handle forward during operation. No need to take your finger off the trigger or lose sight picture to charge the weapon. Can mount your optic as far back are you desire without difficulty in charging weapon. 

BCA makes very high quality barrels. Made out of milspec 4150 CMV and phosphated for corrosion resistance. 

The Guntec rail is very high quality and comparable to many other higher end rails that cost 2x or 3x as much. Barrel nut and screws are hardened steel and the mounting system is rock solid.

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

*Optional* - Add an Azimuth Technology 6.8 SPC II Nitride BCG.

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

More Information
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