A Rifle Most Modern: The 18 inch as a homeland defense rifle. - AR15.COM
Adams Arms (AA) Evo Ultralite Ultra-Light/Super-Lightweight Gas Piston/Op-Rod AR Carbine Upper Receiver Assemblies (Mid-Length and Carbine-Length) for 3-Gun Competition and Combat: Super-Accurate and Super-Fast! – DefenseReview.com (DR): An online ...
Since 16 inch rifles are still cool here's mine and my 18 inch SPR build. : r/ar15
AR 15 & M4 Barrel Length
Which AR-15 Barrel Length: 16, 18, or 20"? - YouTube