Odyssey RPM Select Fire Modification

Please keep in mind that any changes made to your marker may not be acceptable at some fields and in most tournaments.

The select fire modification to the New Model/Style RPM allows for mode changes to be made between Semi-Auto, Ramping and Full Auto without the removal of the grip or the need for jumper installation, jumper relocation or jumper replacement.

This modification requires measuring, drilling and soldering, if you cannot do one or any of these things for yourself then please do not try this procedure. I will not be responsible for any mistakes made by you or anyone who attempts this modification to their own or a friend’s marker. You are responsible for your marker and your actions too and with the marker.

Parts required include; sub-mini on/on toggle switch, rechargeable phone battery connectors of the proper size (phone battery & other connectors may require modification).

The Process

Carefully measure the area to be drilled for the switch installation. I highly suggest that you measure your switch and trigger frame and calculate for yourself the center for the hole to be drilled. It is said that the RPM specifications vary from marker to marker and it would be safe to say there may be some variances in the switch as well. They clearances are pretty tight to get the switch installed, so be certain your drilling in the right spot.

Route your wiring through the marker to make sure your connectors have enough wire length to complete the job. Depending on the connector you get you may have to file or sand the edge off of the AUX port connector to allow for a proper fit. The J10 connect has more room and shouldn’t require any modification. I got my connectors from some old cordless phone batteries. There may be a better source for them, but Radio Shack didn’t carry any and I knew we had these at home and with minor plastic removal on the sides of the AUX connector they fit and worked well enough.

Just a quick map of where the leads need to go and the switch solder to wiring lead solder locations. Note that I cut off the tabs labeled 1 & 6 simply to reduce clutter. Also, it can be seen that the two black wires (which actually have continuity when tested with a DVOM) were solder to the middle and the red wires were soldered adjacent to their respective black wire connector. Its pretty simple once you stop and think about it, your simply using the switch to make and/or break contact rather than the supplied jumper.

A picture of the measurement of the overall height of the switch when mounted in the markers trigger frame, it sticks out just over ½ inch.

The Finished Product

I’m overall happy with this Modification / Upgrade. With the eyes on I ran a full hopper through the marker in no time with out single chop.

Select Fire Modes of Operation

With the Switch in the forward position (toward the barrel) the marker is in Full-Auto or Semi-Auto and can be switched between the two modes by pressing and releasing the safety button. With the Switch in the rearward position (toward the Ram) the marker is in Ramping mode (limited to 15bps by the board).

You need to determine how you want to configure your wiring. For me it was simple put Full-Auto forward on the switch, so it could easily be switched to Full-Auto by pushing forward with my right thumb and back to Semi-Auto by pressing on Safety Switch. Ramping is with the switch in the rearward position for local tournament play. You can reverse this and make Ramping forward and Full & Semi-Auto rearward, the choice is yours, and all you have to do is plug the terminals in the opposite way.

The switch itself and the ability to change modes may not be allowed at some fields or sanctioned tournament events. Check with your local field before you perform any part of the modification (at least see if it will be allowed if the switch is disabled by unplugging the connector).

Parts availability

All parts are readily available, for example the white terminal connectors can be taken from some used cordless phone batteries (please note the polarity of the black and red wires as they may need to be switched in some applications). I have found new phone battery connectors on the web, but the parts were not available at this time, if this changes I will post the web-site later. The switch can be bought off eBay or possibly found at Radio Shack, it is a Sub-mini On/On Toggle Switch.