My Custom .25 Caliber 16" LW Barrel Disco Carbine

Well my Disco Carbine is now a completed project. It was a long time coming as the LW barrel took forever to come and now to the details of the little beauty.
It started off as a factory Disco and from there the following have been done:
Everything was designed for it to be a .25 caliber Disco
Added a BNM Weaver style Multi breech with shroud
Cut 3 from the air tube
Installed a 16 LW choked barrel
Custom valve and transfer port
Hammer (striker) was modified to incorporate a means to Adjust Stroke Length for more flexibility in tuning
Disco Double Tube
Gauge was relocated to the back end of the Double Tube and utilizes the same stock hole as the factory gauge used. This permitted a big increase in air flow through the valve, seeing there were no valve block restrictions. It also added an extra 1 ½ to the normal Double Tube
Modified to be able to us higher fill pressures (do not try this with your Disco as it could be a safety issue)
Brass ends to both air tubes
Brass barrel band
Added a custom brass Power Adjuster
Custom brass trigger
Modified QB78 Target Stock
Three screw trigger mod with hardened pins and lubed
Depinger in the factory tube to reduce ping

All the machining and custom parts where done by Lloyd of Airgun Lab and he worked his magic to get me the FPE I was looking for and with a great number of shots. Without his help this would never have turned out so nice. THANKS LLOYD! I was hoping for a minimum of 8 shots and kept my fingers crossed that I would get 12 - 16 and as it turned out I'm getting 24 but I have much more tuning to do. Pretty difficult to tune when no one has the Kodiak or Barracuda 31.2 grain pellets in stock, PA just got the Kodiaks in and I ordered 8 tins, still have 8 tins of Barracudas on order since April 30th. When you look at the shot strings you will need to remember that this is a .25 caliber 16 barrel Disco Carbine. I was told by a good number of AG PCP enthusiasts when I started that with a 16 barrel and being a .25 caliber it was going to be very difficult to accomplish.




Now for the shot strings:
1st string is for the one 3 shortened factory barrel: Fill pressure 2400 PSI Ending Pressure 900 PSI DO NOT USE MY STARTING PRESSURE IN YOUR DISCO AS IT IS ONLY BUILT TO HAVE A MAX OF 2000 PSI. MINE HAS BEEN MODIFIED TO ACCEPT HIGHER PRESSURES

794.81 - 856.32 - 817.51
805.22 - 855.11 - 798.32
820.56 - 854.14 - 775.41
830.87 - 847.14 - 741.86
849.29 - 836.73 - 701.81

Now for the 1st string with the Double Tube:
Fill pressure 2400 PSI Ending pressure 1100 PSI DO NOT USE MY STARTING PRESSURE IN YOUR DISCO AS IT IS ONLY BUILT TO HAVE A MAX OF 2000 PSI. MINE HAS BEEN MODIFIED TO ACCEPT HIGHER PRESSURES

798.00 - 858.81 - 836.21
814.54 - 860.82 - 823.58
825.37 - 855.17 - 817.29
828.42 - 860.40 - 806.13
830.41 - 861.68 - 792.41
844.02 - 851.98 - 778.10
848.87 - 848.57 - 760.88
856.08 - 840.15 - 743.27

2nd String with Double Tube
Fill pressure 2450 PSI Ending pressure 1100 PSI DO NOT USE MY STARTING PRESSURE IN YOUR DISCO AS IT IS ONLY BUILT TO HAVE A MAX OF 2000 PSI. MINE HAS BEEN MODIFIED TO ACCEPT HIGHER PRESSURES

795.22 - 836.15 - 839.69
811.21 - 849.05 - 831.44
811.97 - 852.46 - 825.71
826.27 - 860.64 - 815.04
829.44 - 858.26 - 802.87
832.01 - 856.98 - 790.81
842.78 - 853.6 - 778.05
846.67 - 847.56 - 758.64

So as you can see the Double Tube mad a big difference in the shot string and power that this little Carbine has. I have more testing to be done when my pellet supply arrives!! If you have been thinking about adding a Double Tube Kit to your Disco just imagine what it would do to your Disco if I gained the extra shots and power with my 16 Carbine.

Norm