[NorthMountain]

Bottom Line Up Front: I want a 9mm "pistol" utilizing the AR platform. Commonly referred to as an AR-9. My question is, should I buy one or should I undertake the task of building one?

Building isn't rocket science ... and IS lots of fun. The internet abounds with "how to" resources. Do some research, and build it.

[USMC79to83]

I would second this and add that CMMG is VERY GOOD STUFF.

You won’t go wrong either way.