Disco SSG thread

[Buldawg76]

David
I was not aware the Prod mags and Mrod mag are different and wonder if its a width thing for the ability to use longer pellets in a Mrod versus a Prod. My Mrod mags are 11/16' wide total width and the recess that slides in over the barrel is 9/16' so that a 1/16' difference that the barrel should be protruding out from the breech in the mag well area and the recess diameter is 7/16' to fit over the barrels diameter.. You can measure your Prod mag to see if it is narrower overall and in the barrel recess pocket or has a recess to fit a smaller barrel diameter. Mine is a 177 Mrod but I believe the 22s are the same size and only the 25 mags are thicker to accommodate the larger pellets in 25 cal.

Are your mags a 10 shot mag or possibly only 8 or 9 shot as that may be the difference in part numbers so a Mrod may fit as well in the prod.

I would think it possibly easier to machine an o ring groove on the Prod bolt to seal in the disco barrel instead of cutting that groove in the disco barrel to seal on the bolt probe, but then I have never tried to modify one to fit the other either so you are breaking new ground in that respect and I am sure all here would be interested in the results you come up with as I know I am indeed.

Mike   

[David Mccann]

hmm, mine measures same as yours. mine is .22- 8 shot. if yours is 10 shot, that means the "wheel" is larger dia., and that may be the prob....... anyone else know for sure?

[David Mccann]

i was afraid if i put the oring on the probe, it would be a constant chore changing out the worn oring, as a result of dragging in and out of the mag, maybee not. the challenge to put it inside was greater, soooo, always being one who loves challenges, i elected to go there with the oring.

[David Mccann]

mooseslayer must be testing his toy, he didnt post yesterday. how are you doing with it mr. moose??. i ordered springs today. i found 1 in some junk boxes i was digging through. gonna put it in and try it. shooting with the shroud and baffle sys off yesterday, i cant say accuracy was leaps and bounds better.seems to like heavier pellets.and onward we go. cheers

[Dairyboy]

Are you having accuracy issues? Curious why you thought removing the shroud system would increase accuracy. As far as I know it only works if either barrel or shroud are bent or if it's clipping the baffles.

[David Mccann]

yes, i am having some kind of accuracy issue. perhaps the pellets arent fast enough? i used the chrony the other day, and was seeing 775 ish fps. i just finished installing bobs SSG setup. maybee tomorrow afternoon i can try it again and see where we are.TALKTOYEZ

[mooseslayer]

No testing since the weekend. Busy at work and home. I am tired of wasting pellets just shooting across chrono in basement. The weather is starting to warm up here, snow is gone now,  but now all-day rain (I am in Canada). I am hoping to do some actual shooting outside this weekend if the weather holds.

[David Mccann]

yea, spring seems to have sprung here too. gotta get that tiller working... and the lawn tractor. been nice here for several days. temp in the 70's. hoping to find time this weekend to shoot some pellets. cheers

 david

[David Mccann]

i did find that the foam material i used in my baffle sys, was too soft... because when i removed the shroud with the baffle sys still inside the tube end, i looked through it with the light and saw foam sticking through my  stripper holes. maybee that is why my accuracy is inconsistant ?? anyway, ive put it back together with scotchbrite material in the chamber... hope its good. using a mystery spring i found  for the SSG. should have springs from mcmaster tomorrow ,.... hopefully.

 TALKTOYEZ

[Buldawg76]

David
Yea the o ring could be damaged some by sliding thru the mags repeatedly as I had not thought about that since I shoot with a single shot tray all the time as I find it helps improve accuracy, not by much but I shoot FT and not by much can mean a miss or a hit at the kill zone. I doubt that the 2 extra pellet holes in the mag would cause any issue with rotation as the mag is rotated by the internal spring not by the bolt retraction causing the mag to advance so if as you say the outside dimensions are the same the Mrod mags should work in my opinion but the only way to know for sure is to try one and see.

You state you had some foam material in the baffles and now are using scotchbrite instead. The baffle system on the Prod and Mrods in designed to have open air space inside the baffles that allow the sound waves to be broken up as they pass thru the baffles at the exit of the barrel thru the four holes in the end cap on the barrel that seal to the inside of the shroud and travels thru the 4 baffles for a GEN 1 or 7 baffles for a GEN 2 gun and back all the way to the rear of the shroud at the breech. If you put any material inside the baffles or shroud behind the barrel end cap it will eventually wind up in the pellets path out of the barrel and indeed affect accuracy.

I would remove the entire shroud and baffles and swab down the inside of the shroud to clean all debris out of it and wash all the baffles in warm soapy water to remove all lead dust and lightly lube breech and barrel o ring with silicone oil and reassemble with no added foam or scotchbrite at all. While you have the shroud and baffles out clean the barrel with some pull thru patches soaked in a barrel solvent or use a barrel snake till it is bright shiny clean then pull one lightly silicone oiled patch thru it to prevent rust and see if your accuracy returns. I put a couple drops of silicone oil in the breech end of my barrels every 700 to 1000 pellets to help keep the lead fouling to a minimum.

Mike

[David Mccann]

hey mooseslayer, check this out. im still looking for 825fps, but look what a string. im tickled pink

reated: 03-12-2016 02:55:52 PM
Description: ssg reggd 300o psi
Notes 1:
Notes 2:
Distance to Chrono (FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight (gr): 14.300
Temp: N/A
BP: N/A
Shots
# FPS FT-LBS PF
55 757 18.20 10.83
54 768 18.73 10.98
53 764 18.54 10.93
52 768 18.73 10.98
51 769 18.78 11.00
50 766 18.63 10.95
49 773 18.98 11.05
48 770 18.83 11.01
47 772 18.93 11.04
46 771 18.88 11.03
45 767 18.68 10.97
44 765 18.59 10.94
43 770 18.83 11.01
42 770 18.83 11.01
41 774 19.03 11.07
40 769 18.78 11.00
39 774 19.03 11.07
38 773 18.98 11.05
37 771 18.88 11.03
36 773 18.98 11.05
35 774 19.03 11.07
34 766 18.63 10.95
33 772 18.93 11.04
32 773 18.98 11.05
31 773 18.98 11.05
30 774 19.03 11.07
29 777 19.17 11.11
28 771 18.88 11.03
27 779 19.27 11.14
26 774 19.03 11.07
25 774 19.03 11.07
24 784 19.52 11.21
23 776 19.12 11.10
22 778 19.22 11.13
21 774 19.03 11.07
20 767 18.68 10.97
19 774 19.03 11.07
18 771 18.88 11.03
17 772 18.93 11.04
16 777 19.17 11.11
15 765 18.59 10.94
14 772 18.93 11.04
13 774 19.03 11.07
12 780 19.32 11.15
11 775 19.07 11.08
10 771 18.88 11.03
9 771 18.88 11.03
8 772 18.93 11.04
7 767 18.68 10.97
6 771 18.88 11.03
5 771 18.88 11.03
4 768 18.73 10.98
3 767 18.68 10.97
2 759 18.30 10.85
1 767 18.68 10.97
Average: 771.16
StdDev: 4.73
Min: 757
Max: 784
Spread: 27
True MV: 771.25
Shots/sec: 0.06
Group Size (IN): 0.00

[Tater]

Sweet looking shot string there David.

[mooseslayer]

That is awesome! Is that got a regulator on it? What spring did you use and how long was it?

[oldpro]

 You guys are making me want to get a Disco! Good stuff here guys. David thats a awesome string well done brother!!!

[David Mccann]

hello buldawg. thank you for the advice on the barrel and baffle cleaning. its not quite a stock setup though, as the shroud has been made from carbon fiber tube, and the baffles are alum., and so is a simple air stripper.  3 pcs total are nestled at the front of the shroud. also made at home were the 2 parts that have the orings and keep the bbl centered inside the shroud,centering bushing on brch end and muzzle end of bbl were all made by me. the forward "centering" bushing has holes drilled to allow stripped and captured air to flow into the length of the shroud. with bobs' ssg incorp. into this gun, it is so Quiet at it current power level, the hammer hitting the poppet is louder than the muzzle report. 770 fps and near silent. never seen or heard of such in these parts.cheers

[David Mccann]

thank you oldpro. i feel as if im not worthy of your praise. your many posts have helped me along my way . i thank you sir

[David Mccann]

hello mooseslayer, yes sir i purchased a milo70 reg and followed instructions here on this forum and installed it myself. auto tech by trade, so fairly handy with tools n such. the spring i found was .040 wire dia  .380 OD 2" long, wound up preloaded on the guide rod about 3/4" had to drill out the prod striker wider and deeper to contain the spring

[oldpro]

 Right on were all here to help each other. post some pics of that rifle of yours.

[mooseslayer]

Thanks for the info. You are right about the big bonus with the SSG being the huge reduction in noise, especially at a little  lower levels. What were your fill levels and air usage? And pictures of final product and gun would be nice.

[Tater]

hello buldawg. thank you for the advice on the barrel and baffle cleaning. its not quite a stock setup though, as the shroud has been made from carbon fiber tube, and the baffles are alum., and so is a simple air stripper.  3 pcs total are nestled at the front of the shroud. also made at home were the 2 parts that have the orings and keep the bbl centered inside the shroud, brch end and end of bbl were all made by me. the forward "centering" bushing has holes drilled to allow stripped and captured air to flow into the length of the shroud. with bobs' ssg incorp. into this gun, it is so Quiet at it current power level, the hammer hitting the poppet is louder than the muzzle report. 770 fps and near silent. never seen or heard of such in these parts.cheers

That sounds really interesting, please do post pics. Did you have to use a riser?