I am very intrested to have magazines with limited ammo and reloading
Any rifle no matter how futuristic it may be, it has to be re-loaded at some point. And a magazine fits in there. From studying your rifle in particular it looks like it has a 30 round magazine. It should not shoot for ever. I would be very intrested to see reloading, magazine clips with 30 rounds each and also rifle overheating which happens if you decide to empty a magazine out 100%. Weapon jamming.