Rohm Twinmaster Sport

[HarrisK]

Hi I am just about to acquire a Twinmaster Sport, does anyone know what the shot count per fill and the Ft/lb I could expect from this pistol?

[leetrenchard]

Is that the co2 or pre charged?

[HarrisK]

Hi It will be a PCP

[leetrenchard]

I have a PCP version of this.

The shot count is huge but I don't know the number.

Originally they're about 2ftlbs, I have the power upgrade kit on mine which brings it up to 3 and a bit.

Pay careful attention to the barrel gap as they lose a lot of power there if it's too large.

[HarrisK]

Thanks for the information, I have now got my pistol it's running at 3 to 3.2 ft/lbs 440 to 450 ft/sec so must have had the upgrade.
Just a couple more questions if you don't mind 1st you mention the barrel gap? not sure just what you mean, do you have more information please? 2nd how do you change the rear sight blade, it appears to be sprung loaded and will move over to one side but still will not come out? don't want to put too much pressure on it without knowing if that's the way to do it?

[leetrenchard]

Barrel gap is the gap between the rear of the barrel and the magazine or single shot loader.

The single shot loader is very slightly thicker so I set mine up to the smallest gap I could that would allow it to move.

There's a threaded collar on the barrel where it meets the frame, I made a rubber collar out of a piece of fuel pipe so I could grip the collar without damaging it (there's a special tool for this collar that I don't have). Once the collar is loose the barrel turns on a thread in the frame.

A 1.5 thou feeler gauge helped me at this but you could use thin paper or similar.

Reducing this gap made my rohm far quieter and sounded less powerful but added 100fps.

Not sure about sight blade but will have a look.