I know a lot of folk who have f**ked up their HW100's due to powering them up because their used to guns that you can feel a twang through when shot, but the 100's are not like that, they lead you to think that they are under powered, but if anyone believes their gun is, then just get a mate to shoot you on the arse cheek and tell me that they're under powered at 10.5, and don't forget to post the pix of your bruise on here, I could do with a laugh
You've more chance of finding yourself owning a overpowered one than a underpowered one in my experience !