This upper receiver is intentionally machined to tighter tolerances to fit our T15BDX receiver.  For the best possible fit, this upper receiver should be purchased at the same time as the T15BDX lower receiver so that we can verify the upper and lower receiver pin match before shipping. 

Although there is a high probability that this matched upper will fit other manufacturer's lower receivers, due to machining variations, this matched receiver may be too tight to get the front and rear pins through on receivers other than our T15BDX Billet Deluxe receivers.  If you want to use this tighter tolerance upper receiver on other receivers, anticipate the possibility of having to use a round file to custom fit the mating holes in the upper receiver to your lower receiver.   Our standard A3 Upper Receiver will fit Colt spec receivers without any fitting or modifications required.

Stripped AR15 upper receiver, A3 flat top configuration.  Precision CNC machined from US certified 7075 heat treated forgings to complimentary match our T15BDX Lower Receivers for a better fit than can usually be obtained from random assembly of uppers and lowers.  Each upper receiver is hand deburred and Type II hard coat anodized for ultra durable finish.   Ready to assemble with your upper receiver parts kit.