Building an 8.6 Blackout AR

Caleb from Brownells walks through building a large frame AR-10 upper receiver chambered in 8.6 Blackout. Often described as the AR-10’s version of 300 Blackout, the 8.6 Blackout is designed for subsonic shooting and excels when suppressed. In this video, Caleb explains the cartridge, details the parts selection including Aero Precision receivers, Faxon barrel, Midwest Industries handguard, Dead Air suppressor setup, and Strike Industries Arca rail, then assembles the upper step by step. Chapters: 00:00 - Intro to 8.6 Blackout and Cartridge Overview 01:36 - Lower Receiver Setup and Parts Used 02:26 - Aero Precision Upper and Handguard Selection 03:34 - Faxon 8.6 Blackout Barrel and Dead Air Muzzle Device 04:28 - Suppressor Choice and Charging Handle 05:10 - Strike Industries Arca Rail for Tripod Mounting 06:08 - Barrel Installation and Barrel Nut Torque 08:03 - Gas Block and Gas Tube Installation 09:33 - Handguard Fit and Alignment 13:16 - Muzzle Device Timing with Shims 17:12 - Optic Installation (Sig Tango MSR) 18:09 - Suppressor Fitment and Mounting System 19:35 - Installing Arca Rail on Handguard 24:12 - Charging Handle and BCG Lubrication 25:14 - Upper and Lower Assembly 26:07 - Suppressor Reinstall and Final Build Look 26:48 - Next Steps: Handloading 8.6 Blackout and Range Test