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Old 07-29-2013, 11:46 PM   #1
Rdsail
Junior Member
 
Join Date: Feb 2013
Location: Richmond, VA
Posts: 28
Default Bottled Disco .22 Reg @ 1600 psi

This all started by trying to make my disco as accurate as possible in the 30 fpe range. I shoot JSB 18.1 exclusively on this gun.

First is a list of mods that I have done to the disco before I bottled it.

- Mellon Air Barrel (recrowned)
- 6.5 In TKO
- Valve Porting. Increase port, Angled port for better air flow, increase neck ID and Increase intake opening
- Increase barrel port to match Transfer port (transfer port is stock size)
- Prod Hammer
- .041 Hammer sprint about 1/4 in shorter than stock
- Home made Power adjuster with locking nut. (Bought the all the part from McMaster)
- Made a spring guide that allows me to adjust hammer stroke without removing the spring
- Mrod Trigger with slave spring removed
- One barrel band near the breach with two screws
- Second barrel band with 6 screw mods.
- Boyds laminate Stock purcheased from discorus

The disco with this setup is capable of reaching 40FPE.

Now the bottle:
Here is the final picture.


I bought the block and the bottle from JDSairman.com. The block and 22ci bottle

The hardest part of doing this is drilling the block screw holes accurately. They need to perfect so they carry the load evenly.

I cut the disco air tube so I would have 5.5 inches of plenum. If you use a TKO that is the max length you can make your tube with so it clears the 22ci bottle. I used the left over tube to make test hole for the bock. It is a most that you use a drill press or better.



My final results were. 33fpe and +60 shots.

this numbers are from 2750 to 1600 psi.

Shot Number Speed (FPS) FPE
1 903 32.78
2 902 32.71
3 902 32.71
4 905 32.93
5 900 32.56
6 903 32.78
7 901 32.64
8 905 32.93
9 905 32.93
10 906 33.00
11 905 32.93
12 903 32.78
13 899 32.49
14 899 32.49
15 900 32.56
16 900 32.56
17 902 32.71
18 905 32.93
19 903 32.78
20 905 32.93
21 900 32.56
22 899 32.49
23 903 32.78
24 905 32.93
25 904 32.85
26 900 32.56
27 901 32.64
28 906 33.00
29 899 32.49
30 903 32.78
31 899 32.49
32 905 32.93
33 901 32.64
34 904 32.85
35 903 32.78
36 906 33.00
37 906 33.00
38 902 32.71
39 906 33.00
40 904 32.85
41 903 32.78
42 903 32.78
43 905 32.93
44 904 32.85
45 902 32.71
46 899 32.49
47 900 32.56
48 898 32.42
49 901 32.64
50 899 32.49
Number of shots in string: 50

Average FPE 32.74
High Speed 906.00
Low Speed 898.00
Extreme Spread 8
Average Speed 902.46
Standard Deviation 2.25

Average PSI change per shot -23
Approx number of good shots per gun fill 60.87 @ full change. Granted I could have shot down to 1400 or 1300 psi and gain about 10 more shots

next are just pict of all the mods.











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Diana 48 .177, AA S400 MPR FT .177 - Field Target - WFTF, Custom Bottle Disco .22 - 30 fpe, Mrod .25 Project gun
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Old 07-30-2013, 03:42 PM   #2
grumpy
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Posts: 428
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Daniel, thats the most impressive Disco I have ever seen. You should be dang proud of that baby !

Dave
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