Short stroke a pneumag?

[longi]

Hi all, i finally gassed up my pneumag trigger frame yesterday and was suprised to find out that when you fire and hold the trigger in the MPA-3 doesn't reset straight away unless you release the trigger. Now as i am unable to gas up the Retro valve due to not having gotten my my friend to drill and tap the vert ASA, i couldn't fully test my Mag, but i couldn't help but wonder is it still possible to short stroke the marker? As the MPA-3 doesn't reset due to the nature of the way the MSV-1 operates, is it also possible to still bounce the trigger if the MPA-3 is not sighted correctly?

[wjr]

Because it takes such little force to actuate the 3 way, I don't think that you could.

[personman]

Technically? Yes. But since the throw of your threeway is soooo darn short, you'd have to reallly realllllly try hard to do it.

[Pneumagger]

yes. say your walking the trigger poorly and out of sync. If one finger comes down almost simultaneously as the other lifts (like milliseconds apart) then the opportunity exists to shortstroke. It is decrased however due to the fact that a MPA-3 will return extremely quickly soon as the trigger is released.

[the mag guy]

it is, believe it or not quite possible to shortstroke. yes it hardly takes anyhting to open the valve, but you just have to learn the trigger. Now it it harder to do than a traditional mag trig? that answer is yes.


As for the extended ram scenario. thats how you cantune your gun into burst fire or full auto. its wehat I had to do. Just adjust the output of the lpr to where when you hodl the trigger down you can actually watch the sear and the ram bounce against each other.

[longi]

Ahh i see, i thought it might be possible to do both. The short stroking was a real concern, as i'm ace at chopping paint. The bouncing i thought may be also possible due to the nature of the way the whole setup works. So i guess that the excess pressure from the valve when reseting the sear kicks the delrin bolt back into position providing you don't have your finger holding the trigger down and all is good. Sorted geezers! :) Nice 1

[longi]

While i think about it, is there any way of getting the MPA-3 to reset once the trigger has been pressed and not released, ie..the excess air would be dissapated but the MSV-1/2 would not let any further air through, would a 4-way valve do this job?

[the mag guy]

longi, ok I dont mean this rude at all, but I dont think you quite understand how the pneumatics work. all the 3-way is , is a spring loaded on/off. while youre holding it air is passing freely through it. So, when activated, or in the ont position, its just like the lpr was going straight to the mpa-3. The only way to release pressure from the mpa-3 to make it reset is to bleed it off somewhere this, for most people is where the qev comes into play. But the qev only exhausts when air is not moving through the line (just pressure from the previous shot).

Using a 4 way would work if you could get it mounted nicely, but how would you modify the mpa-3 to where it would take air on the back and front and still allow it to fit in the grip? I played with this idea quite a bit while trying to design mine. I couldnt find a ram or a company that would make a ram small enough for me. I am working on a ram similar to an autococker that is ultra tiny, and current designs allow it to screw into the sear arm. Its going to be quite some time before I could start making these. (over a year).


There are two ways I can think of off the top of my head to do what you are asking, but they would require some modification.

First:

Modify your 3-way to where its on whne you pull the trigger, but when you pull just a fraction past, it closes again. Only problem with this it it would be a mechanical hyper/turbo mode. It would shoot when you pulled the trig and when you let go. Not tourney legal.

Second:

Modify your Mpa-3 by drilling a hole next to the barb or qev where the hose is connected. This will be a bleed hole and will immediatley start venting pressure. So theoretically, if the placement and sizing were correct, the mpa-3 could shoot from the initial burst of air but then the remaining pressure behind the plunger would bleed off and the spring could reset the mpa-3. this wouldnt stop your leak however, if you held down the trigger, it would vent the same, except your mpa-3 just wouldnt stay in the foward position. I really dont suggest this route though because it would require a lot of trial and error.

[longi]

No worries, i'm learning as i go along, the more info i get the better!