Unusual RT Pro Issue. . .Now confirmed as micromag 2k9 problem!

[sniper42]

And we have a winner. A longer bolt solved the problem. My first bolt I made from scratch was supposed to be a level 10 replacement but some dimension must be off because all it does is chuff. For the next one I decided to pick up a level 7 bolt from baccipaintball.com for a couple bucks. I turned the outside down and made a sleeve to extend the bolt by .150" and glued it on. I also put a screw in the front so the ball has something to seat against. I will glue some foam to this later.

So far the results are promising. I was able to get up to 300fps before my velocity screw bottomed out. Before the new bolt, at about 240fps, I was getting enough blowback up the stack to launch a ball approximately 1.5 feet up. With the new bolt at 270fps I still have a bit of blowback but it is much less. It will only launch the next ball maybe 6 inches. So a sleeve that is maybe a tad longer might be in order.

With my new bolt the face of the bolt is even with the back edge of the feedhole. Here is a crappy cell phone picture of the new bolt:
i-9wtNb2d-L.jpg

So at some point I think I will have to get my hands on a spare level 10 bolt to make a sleeve for.

Now before testing my new bolt, I had a small hiccup where I apparently shot the ball bearing out of one of my detents.

[nak81783]

Nice work! Just make sure you don't repeat the AGD Superbolt issue where the sleeves wore out, cracked, and came flying out the barrel. I think this was because they used delrin, but just keep an eye on it.

[need4reebs]

can you make a sleeve for tha bolt you made to replace a lvl 10 bolt? have you figured out wat dimension/dimensions were off on that bolt?

[sniper42]

I had that thought. This one will be more of a proof of concept until I can come up with a more permanent one. The last thing I want is to shoot part of my bolt at someone.

[OPBN]

I still don't get why some work and some don't. I would really like you and I to send our bodies to someone to compare to see what the difference is.

[sniper42]

I'm guessing that either the breach operation or the entire bottom operation with the grip frame holes, sear hole etc was offset by .150 and an entire batch got machined that way. Hence why there are a few markers out there that have the same issue.

[need4reebs]

its pretty safe to say that some of tha bodies...tha ones with tha velocity issues....might have had the breach machined backwards, which would have moved the feed hole just a lil further than it should have been. nobody ever complained about having any issues with mounting tha frames or any sear issues did they?

have you guys asked Luke to take proper measurements of tha MM2K9 that he is selling to see what measurements he comes up with? maybe ask if he will test tha velocity on his MM2K9 as well...see if he will help yall out?

[sniper42]

All of the holes on the bottom would be machined in one operation. That means that everything would still mount up correctly but if the zero point for the program was off by .150" it would move all of those holes by .150".

[Laku]

All of the holes on the bottom would be machined in one operation. That means that everything would still mount up correctly but if the zero point for the program was off by .150" it would move all of those holes by .150".

Yeah but then they wouldn't match with the valve. The body would also need to gain or loose that much more length on the back and move the frame mounting screw hole as well.

[knownothingmags]

its pretty safe to say that some of tha bodies...tha ones with tha velocity issues....might have had the breach machined backwards, which would have moved the feed hole just a lil further than it should have been. nobody ever complained about having any issues with mounting tha frames or any sear issues did they?

have you guys asked Luke to take proper measurements of tha MM2K9 that he is selling to see what measurements he comes up with? maybe ask if he will test tha velocity on his MM2K9 as well...see if he will help yall out?

yeah that makes more sense. because my dust black one is great and works proper. it sucks that people have these issues.

is there a way to get a total tally of people who have these issues and present them to PTP?
if you went to them with a full number of how many new breeches need to be made, maybe they will make some replacements?

[nak81783]

Yeah but then they wouldn't match with the valve. The body would also need to gain or loose that much more length on the back and move the frame mounting screw hole as well.

Not necessarily. We've determined that the length from the rear screw to the bolt spring seat can vary greatly and still work.

It really all depends on their processing. I'd have to see what they used for datums in each of their unknown number of setups.

[Laku]

Not necessarily. We've determined that the length from the rear screw to the bolt spring seat can vary greatly and still work.

It really all depends on their processing. I'd have to see what they used for datums in each of their unknown number of setups.

Ah yeah.. was actually thrown off by those stoopid imperial units. Mentally converted that to much larger offset. But if the change was more like 5 mm or more it would likely miss align the on/off hole.

[need4reebs]

All of the holes on the bottom would be machined in one operation. That means that everything would still mount up correctly but if the zero point for the program was off by .150" it would move all of those holes by .150".

it sounds like only the breech measurements are off and since the feed hole wasnt directly centered it sure does sound like if it was accidentally machined backwards all tha problems your having would be happening? tha main body was prolly machined with tha frame screw holes, sear slot, and the breach screw holes...but when tha breach was machined a possible mistake was made and it was machined backwards. tha breach will still line up with tha screw holes to hold the breach in place but tha feed hole wont be in tha proper place? after reading all this that seems to be the most logical explanation for something like that to have POSSIBLY happened.

[nak81783]

To my knowledge, this is the first MM2K9 body with this issue to be remedied, so nice job AO!

[need4reebs]

To my knowledge, this is the first MM2K9 body with this issue to be remedied, so nice job AO!

mainly you, sniper, dukie, and athomas....yall are sum BAD MoFoS!!!!