Barrel Plug for paintball cal .68

Sexied up version of this barrel plug by AstartesUltra152: https://www.thingiverse.com/thing:2905832

Mainly some chamfers and recesses added and a slightly broader front to perfectly fit a Firststrike T15 barrel.

**UPDATE 2019-05-16:**
Added deflecting surface to bottom part of plug.

**UPDATE 2021-07-13:**
Since the plug component tends to sheer off between the layers eventually, a different approach was taken: A hollow version where a pin with perpendicular layer orientation is to be