COLT SMG UPPER RECEIVER THINGS TO KNOW BEFORE YOU BUY

The upper is a flat prime, naturally, and includes all the regular Mil-Spec fun stuff similar to a dust include and ahead support. Anything shorter than the usual 16-inch barrel is viewed as a short barrel rifle, or SBR besides When you have a stabilizing pistol brace.There are lots of advantages of using a 9mm AR upper receiver. You can consider