I have a QC10 small frame Glock mag compatible lower and the neccessary components to complete it that I've been sitting on for a few years for no good reason.
I'm looking to finally complete the project and build a pistol. Looking for a compatible complete upper with barrel between 6 and 10 inches long. The easy button is to pick up a complete QC upper to drop on top but even pre-covid their prices were fairly high compared to some other options on the market.
I've built a number of ARs over the years but this is my first pistol caliber so I'll admit I don't know what I don't know. I believe the BCG being Glock mag compatible is more important than the upper and barrel but am looking for confirmation and whether any other manufacturers Glock mag upper would drop on? Any recommendations for suitably reliable and durable uppers are appreciated!