Home Forums Hunting & Shooting AR and Tactical Rifles Tac 20 build (pic heavy)

After chambering is complete, I cut the feed ramp. A lot of commercial barrels cut the feed ramp deeper, but I prefer a shallower angle for more case web support. I cut a 30° angle to .100" larger diameter than the chamber (.050" per side).


The final step is to lightly polish the feed ramp and break the sharp edges with emery cloth, and burnish the chamber. I use 0000 steel wool wrapped on a bristle brush for burnishing; we want a tight fit that will apply lots of pressure.


Final result - a clean smooth chamber and feed ramp with no detectable roughness or rings in the chamber.


That concludes the chambering part of this job. What remains is to profile the barrel, size & drill the gas port, and thread the muzzle; I'll share progress of those as they happen but it may be a few weeks from now.