gotboostvr
Member
Steel cased ammo from overseas typically works better in the loose chambered guns from overseas. When it comes to AR's, its really a roll of the dice if it will work or not. I think it is tight chambers. I have seen that stuff stick in AR chambers, and sometimes the extractor will bust the rim and the case needs to be removed with a cleaning rod. I have seen mini 14's do the same thing.
The issue with steel 223, is the nearly straight taper of the cartridge, combined with the lack of elasticity of steel.
Brass will shrink back a little after expanding, the steel dosen't (at least, not nearly as much) and binds itself to the chamber walls. The more extreme taper of 7.62x39, means it only needs to move a very small amount to release off the chamber walls, versus the almost straight 223 case body needing to drag along the chamber to extract.
A little lubrication will go a long way to help the 223. Emphasis on A LITTLE. You don't want it dripping. Shoot for "your phone screen after eating fried chicken while scrolling THR"