Whenever I fire a weapon (most noticeable when standing and with the MXR 6.5mm w/RCO) I feel like the recoil is too unrealistic...
To explain it better: when I fire while using the scope, it feels like the weapon performs an upwards movement and yet it doesn't give me the push-back sensation you would normally get because of recoil, and it also feels too 'structured' in a way of saying...

I'd say the recoil system would need a little more dynamic: less 'upwards recoil' and more push-back!