[Quentin]

Great choice on the Quentin Defense U.S. Army billet lower! I have one too that I haven't built up yet. I also have a DD LPK for it and an ACS. Really all I need is the receiver extension, buffer, etc. Don't know why I haven't put it together yet. With a 20" barrel how about the A2 rifle stock?

BTW, Quentin is my name but I am not affiliated with Quentin Defense except as a customer.

 

[Quentin]

Good point on the A2 when you have multiple shooters. My vote would be for the ACS then. I actually like the CTR better but most of my ARs are light profile 16". The extra weight of the ACS would match a longer barrel better. Have you also looked at the ACS-L and STR?

 

[Quentin]

Yeah the ACS-L is lighter than the original ACS but only a couple ounces. And you lose the extra storage and nice cheek weld.