The endcap is held on by (1) screw. See my above post. The red circled part is where the screw is hidden. Once the screw is removed, you can tap off the endcap.
Yep, I got that one out of course. The endcap still wouldn't move. I almost "tapped" off the whole paint and some of the metal of the endcap because it was that stuck. On the other hand, I've heard stories of people being able to just take the endcaps off by hand, so I guess it's different from blaster to laster...