but here is my question, why would it cycle the brown bear ammo and not the megtech? does the megtech has less pressure than the others? what sux is i spent all my money on the gun that i cant really go out and try other brands at the moment.lol and once again thank ya'll for the info, this is a pretty neat site!
I don’t have either Brown Bear or Megtech ammo.
If you want to have a rifle that will consume any ammunition on the market, get a bolt rifle, a single shot, or a lever action.
Semiautomatic military rifles were not designed to shoot anything but the issuing nation’s service ammo. Soldiers were issued ammo by their military organization. The military wrote and controlled the ammunition specification; the operating characteritics of the ammo matched the performance characteristics of the rifle, and every thing was fine.
Until civilians acquired the rifles and expected them to shoot any brand, any bullet weight, any powder, and any old nasty brass.
Your rifle will work reliably within a limited range of ammunition parameters. If you ever reload, I would recommend staying with 150 grain bullets, powders close to IMR 4895 burn rate, and keep velocities at 2600 fps in your 18” barrel (based on the performance of Australian Ball). If you don’t reload, find a brand that works and stick with it.
It is also incumbent on you to keep the chamber and sliding surfaces of the rifle clean.
P.S. Australian ball function perfectly in my rifle.