First: I have yet to see any lower end guns, especially in the Chinese rifle’s using synthetic seals not having at least some damage, often times minor, and some with sever damage, which the buyer will never know even while shooting it unless it is extremely bad or he breaks a spring or he has a Chrony and can see the power loss. Secondly: again, especially in the Chinese clones, the vibration or spring twang and torque caused by poor or incorrect lubrication, and poor quality control, rough components, and poor spring design and construction causes’ inconsistency, loss of power and inaccuracy. Thirdly: either little or no lubrication, or incorrect lubrication of other critical internal parts. Fourth: smoother, softer, and depending on the gun, shorter more predictable trigger pull, and finally, resolves most rough cocking conditions.