It can happen where the purchaser gets it wrong also. A guy bought my prosport off free ads. Turns out i knew hom from working together 40yrs ago. Anyway 2 days go by and he phones me to say he cocked the gun and loaded a pellet in it and it will not fire. So i go to his house pic up the gun and he explains what happened. You guessed it he had not cocked it till the safety popped out. So i pulled the underlever back a bit further and the gun fired ok. Stupid bloody thing is he ownes a tx200 so should have known you have to cock till the sear engages just like the tx. He was well embarrised. He saw me fire it several times at my house so you think he would have git the idea how it cocked.