08-15-2023, 04:17 AM
I'll third the build your own route. The Aero M4E1 lower is a great choice, it fills the gap between the run of the mill forged receivers and the expensive billet lowers. I would go with one of the upgraded trigger groups, which one depends on your preference and budget. I have found A2 stocks and buffers work better with ARCs and Grendels than carbine stocks. Also an adjustable gas block on your upper is a good idea, if it doesn't have one on it already. Other than that, have fun with it and refine your setup to your needs. Hope this helps.
I am your uncle!