The tool less bolt removal provides access to the marker's internals without the need to use a tool. Push in on the center pin while holding onto the knurled part of the knob. Pull backwards on the knob and the assembly pops out. Turn the knob countercolockwise to loosen the end cap assembly and gain access to the internals. To reassemble, insert internals and thread the end cap in until tight. Push the pin and end cap together towards the marker until the end cap is in its normal operating position.
The Tooless Bolt Removal feature of the XVR is a feature usually found just higher end tournament markers. Tippmann's take on this feature is quite unique. We have a video showing a full break down of this component of the Crossover XVR Paintball Gun.
Start by pressing on the back middle button on the end cap. You have to press in and at the same time pull out on the end cap itself. It'll pop out about 3/4 of an inch. You now have an easy handle to grab on to and unscrew the spool valve. Once unscrewed you can pull out the whole valve and see completely through the gun.
To gain further access to the parts of the end cap you need to start by removing the very back oring. This releases the end cap retaining pin. Now, if you press in the back button again the end cap knob will release completely from the end cap base. Inside the base now you can see the spring that provides the back pressure fo the end cap push pin. There are 2 small ball bearings that are used to lock the end cap knob in it's forward or backward position. Those are EASILY lost. Be careful. As you pull out the center pin from the knob there is nothing holding those in place. It's the plunger from the knob that holds them in place from the inside and the base that holds them in place from the out side. Other than that they're free to roll away. Not a lot of parts here.
Reassembly is a bit tricky. Put the piston back in the end cap knob making sure to line up the flat surfaces with the holes for the retention bearings. Then you can drop in the bearings. A trick at this point is to take a tiny dab of grease and smear it in to the hole. This is just enough to keep those in place during reassembly. Now drop the spring back in the base and push the cap back on making sure that the spring stays centered. You'll hear the bearings and piston snap in to place under the tension of the spring. Line up the holes in the base with the grooves in the cap. Replace your retention pin and oring to keep it in place and you're set. The bolt assembly can be put back in the gun and screwed in finger tight. This does not need to be cranked down tight. Push the back pin in now and you can push the end cap closed and you're done!