I tried this plugin, really good. I modified MaxUses, MaxClipAmmo and weapons recoil without problems.
But you can't reload your weapon if has more ammo of standard value.
Example: if you set MaxClipAmmo of P250 to 13, you can't reload if you have more than 8 ammo (standard value) in gun.
I didn't try all features. Ahh you can't edit item name.