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Old 09-22-2012, 07:53 PM   #1 (permalink)
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JT Splatmaster z200 Shotgun Picture of Internals

I just picked one of these up from the store and opened it up. Here is the picture of the internals. I just wanted to put these up so that other people who were interested in this gun could get an idea on what they would have to work with modding.



The breach also has double detents on both sides.



Here is the first spring I found. Since it was too long I had to cut it down a little shorter than the original so that when it compressed it would still travel far enough to have the sear catch.



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Last edited by Chris From Flurry; 09-27-2012 at 12:43 PM. Reason: added more pics
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Old 09-22-2012, 08:37 PM   #2 (permalink)
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i opened mine up about a week ago. i actually split the barrel portion not knowing i didnt have to and putting in that feed spring with that blockoff door was a pain.

the tension on that main spring is pretty high. and according to what Simon said, we need 3x the force needed on that spring.

making a new metal sear and trigger looks easy enough, its the posts on the shell that i worry about.
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Old 09-22-2012, 09:09 PM   #3 (permalink)
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I just picked up a new spring for it so I'll see what happens once I get back together.
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“She’s totally gross over 90% of her body. The other 10% is crazy nasty.” - Dr. Ice Cream
"Although where I come from, we call it Quartz, Parchment, Shears." - Pops

Black barrel covers will get you bonus balled.

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Old 09-27-2012, 12:45 PM   #4 (permalink)
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I just added more pictures and I'm still waiting to see where it chronos at.
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“She’s totally gross over 90% of her body. The other 10% is crazy nasty.” - Dr. Ice Cream
"Although where I come from, we call it Quartz, Parchment, Shears." - Pops

Black barrel covers will get you bonus balled.

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Old 09-27-2012, 02:32 PM   #5 (permalink)
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Originally Posted by Chris From Flurry View Post
I just added more pictures and I'm still waiting to see where it chronos at.
Any chance you could figure out the spring constant? Would help when doing force calculations to see what type of spring would be needed to get the balls up to usable velocity.

also, are you going to use normal .50 paint or the JT .50? I think the breaking strength of the shell is much less on the JT paint, so that may effect teh ability to use a stronger spring.
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Old 09-27-2012, 05:55 PM   #6 (permalink)
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I don't have any practical way right of measuring the force needed to compress this spring fully. I might have a way of doing a rough calculation of it using a digital scale and cocking it. I'm not sure if that would work correctly.

I'm using the JT .50 cal paintballs. It's pretty much is an Ultra Evil like shell. No matter the spring used it shouldn't make a different with the paint. The 68 cal variation of this paint can be shot out out of normal guns at 300 FPS so it shouldn't be a problem here either. Nothing is contacting the ball but air.
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My FEEDBACK 55/0/0

“She’s totally gross over 90% of her body. The other 10% is crazy nasty.” - Dr. Ice Cream
"Although where I come from, we call it Quartz, Parchment, Shears." - Pops

Black barrel covers will get you bonus balled.

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Old 09-28-2012, 12:57 AM   #7 (permalink)
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Originally Posted by Chris From Flurry View Post
I don't have any practical way right of measuring the force needed to compress this spring fully. I might have a way of doing a rough calculation of it using a digital scale and cocking it. I'm not sure if that would work correctly.

I'm using the JT .50 cal paintballs. It's pretty much is an Ultra Evil like shell. No matter the spring used it shouldn't make a different with the paint. The 68 cal variation of this paint can be shot out out of normal guns at 300 FPS so it shouldn't be a problem here either. Nothing is contacting the ball but air.
hmm...I thought I read something about a 1 joule break, normal .50 is around 5, but it's a softer impact when shot I guess.
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Old 10-03-2012, 10:50 AM   #8 (permalink)
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where did you get the new spring from?
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Old 10-03-2012, 11:00 AM   #9 (permalink)
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where did you get the new spring from?
3/4 x 10-1/2 Compression Spring (6 pieces) - Amazon.com


Or go to your local hardware store.
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Old 10-03-2012, 03:45 PM   #10 (permalink)
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I got the spring from a Menards store by me but they also had them at the ACE hardware store. It cost me $2.xx something. If you can find one that is shorter already then that would be best.

I'm going to try and test out another spring though because this one still doesn't have me at 200 fps yet. I chronoed the gun and it's shooting between 167 and 178. This is a 40+ fps increase since mine was originally shooting in the mid 130's.

I may also try skipping putting in a different spring than the one I have now and just try lubing up the main oring really well so that it slides with the least friction and see about o-ringing the back of the "bolt" to seal the breach better to not let any air escape backwards. Those were just some thoughts and I'm not sure if they would really make any difference.
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My FEEDBACK 55/0/0

“She’s totally gross over 90% of her body. The other 10% is crazy nasty.” - Dr. Ice Cream
"Although where I come from, we call it Quartz, Parchment, Shears." - Pops

Black barrel covers will get you bonus balled.

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