CaptainTardy

Can anyone kindly translate this piece of text from an instruction manual from Japanese to English please?

http://imgur.com/KvPAe

The context is some warning about an Airsoft pistol. The image near it has some motion of pulling the slide chamber thing of the gun forward, so I'm worried that the image I posted is something like "Don't pull it forward! It will break!"

Everything else in the manual is helpfully obvious with the nice cartoon pictures, apart from this one bit.

Thanks!