Different types of DYE SS?

[Harry Painter]

I found this picture at www.p8ntballer.com (peightnballer?), one barrel has the hole in the back and the other one has the little bump in the middle. Any differences?

[GreatOne4486]

Each of those barrels are for a different gun thread.

[Pig-Demon]

the one on the bottom is for a mag. that hole is how the ball get in the barrel. the bolt comes thru the "normal" way

[NSUCK]

yea.. stupid AGD had to come and mess everything up.. why couldnt they be smart and make cocker threads like everyone else :P (yes i know agd is old.. just makin fun of them)