SMOKESKULL

Whats the minimum specs for the M4 to cycle properly? I have some russian Domminion low recoil slugs and buck that has lots of trouble. Also some Score target loads are hit and miss. I have read some people dont seem to have any issues with any low recoil ammo and others need higher end ammo only. I love to shoot but dont want to spend a fortune on ammo if theres a flaw with my gun.