MRT GOLD OR DELRIN Mini Bolt Installation

1. Remove all air and paint from the marker. If you don't you could get hurt.

2. Remove rear bottom trigger frame screw that holds the bolt assembly in the marker.

3. Slide bolt assembly out the back of the marker.

4. Remove bolt from front of bolt assembly.

5. If you plan on using the same spring, remove the spring from your old bolt.

6. Place the spring over the front of the MRT bolt. The ends of the spring should be different sizes. If you look close you will notice that one end is smaller than the other. Small end first, place it over your new bolt. Its should have the ability to kinda "click" on to the bolt. If its loose....turn it around and see if the other end is tighter.

7. Apply a nice thin layer of grease to the two (or 1 see advanced set-up below) rear bolt head oring(s). We recommend our Gun Sav High Performance Paintball Marker Grease for best results. Its super slick and allows the parts to move very freely.

8. Apply a thin layer of grease to the front of the bolt assembly. orings. Huh? This is the area that goes inside the back of the bolt. Apply evenly to all three orings. Pics to come....

9. Slide bolt on to front of bolt assembly.

10. Slide the entire bolt assembly. back into the rear of the marker.

11. Securely tighten the rear bottom screw that holds the bolt assembly into the marker. CAUTION! MAKE SURE YOU GET THIS SCREW TIGHT. IF NOT YOUR BOLT SYSTEM COULD FLY OUT THE BACK AND HURT OR KILL SOMEONE. This has nothing to do with our bolt really. But it is part of the original design of the Mini. I've had the entire bolt assembly fly out the back of the marker on me once before and I have only heard of one other instance. But at 125 PSI the bolt system flew out like a rocket. If didn't hit any body in our case, but it def. would have if someone was in its path. So make sure this screw is tight before each time you air up the marker and you should be fine. If you notice it getting loose while you are playing....put your barrel bag on, aim the back of the marker away from people and tighten the screw immediately!!!

12. If you are not interested in messing with the markers settings, that's cool....you really don't need to. I suggest to re chrono your marker to make sure you are at the desired FPS.

13. GO SHOOT PEOPLE!!!

14. When you see someone else using a Mini, tell them about your TechT MRT Bolt. ;)

Advanced Set-Up - The following adjustments are not necessary, but if you are familiar with adjusting the markers dwell and pressure this could improve your efficiency. If you needed to read the instructions in order to to install your mini bolt, you may not want to proceed. The following is really for advanced airsmiths looking for every once of performance.

15 (optional). If you are interested in increased air efficiency you may want to try removing the rear most oring on the bolt. This will produce less bolt drag and allow the bolt to move faster inside the marker. You can adjust your markers "dwell" down in order to make the marker more efficient. Doing this, along with access to a chronograph you should be able to find the best dwell setting. In my opinion, the best dwell setting is one that yields the highest velocity at any given pressure, the highest level of consistency between shot velocity, and one that uses the least amount of air per shot.

This "prefect dwell" can be found with patience, good paint, and a good chronograph (speedometer for paintballs). I like to start with a mini with a high dwell setting like the stock dwell of 38 flashes, and the rear velocity adjusting screw adjusted to yield whatever desired FPS you want. If you are using the stock spring with the mini we recommend using the stock pressure of around 180-190 psi. If you are using a lighter spring you can adjust your input pressure down by some degree to yield the desired FPS. How low you can adjust your pressure is going to be different for each set-up. If not going over 300 FPS is important to you I recommend setting your average velocity to be about 292 FPS. This is because our Mini bolt typically tests to have a standard deviation in velocity of between 2-4 FPS. If you know anything about statistics about 96 percent of the shots fired will fall within two standard deviations of your average. Meaning, I only have a 4% chance of shooting over 300 FPS if my standard deviation is at 4 FPS. If you play tournaments, this is good for you to know if you don't want penalties.

Finding the perfect dwell means recording all of your shot velocities of several test firing groups. Finding the perfect dwell can take as many as 5-6 test firing groups over a chrono. I work my way down by 8 flashes after each test firing group. After each test group I take the average velocity of my shots fired. I then decrease the dwell by another 8 flashes and I shoot another round over the chronograph. With a high dwell (38) you should be getting all the velocity you can get out of the amount of pressure you are putting into the marker, as you lower the dwell your marker will become more air efficient. At a point however, as you lower your dwell you will notice that you start to loose velocity. The change in FPS will be small...but the better your chrono, the sooner you'll notice.

When I was doing my testing with the MRT bolts, I started with my dwell at 38, my input pressure at 190, stock spring and using 1 rear oring I was able to lower my dwell to 7 without a decrease in velocity. From a dwell of 38 I dropped to 30, then 22, then 14, then 6. I noticed my average velocity had dropped from 292 FPS to 282 FPS when I made the change from 14 to 6. In all previous tests my average was the same at 292, so I knew that the dwell of 6 was definitely too low. Once you find a setting that decreases your velocity just up your dwell by 1 for each test group until you get back to 292 FPS. Once you find the lowest setting that you still get 292 FPS, I typically up it by another 1-2 flashes. Upping the dwell by just little from that lowest setting won't hurt your efficiency too much and will help gain back your consistency.

While this type of low dwell set-up does give you more shots per tank, it can lead to slight drop-off at higher rates of fire and is slightly less consistent than it you use the two tail orings and a longer dwell. With two tail orings on your bolt you can find this lowest dwell setting just as I described.

So, while this type of adjusting and testing may be alittle confusing and definitely takes more set-up time than just dropping the bolt in. It can yield higher air efficiency. Which is best? That's all based on what is most important to you....consistency or air efficiency. This two things work opposite one another in all paintball marker set-ups.

If I was someone looking for a balance between the two I would run a dwell of of 33ish using two tail orings, the stock spring. I would use a dwell of 17ish using one tail oring and the stock spring.

I hopes this helped and didn't just confuse you more.

Todd

TechT