You will spend more than the firearm is worth. Try e-gunparts.com
About $50. The RG is generally a low cost firearm of questionable quality.
20-30 USD
Any pistol made by RG is worth less than the metal it is made from.
Depends on the ammo. Hornady v-max .22 mag travels down the barrel at 2200/fps. So give or take that depending on brand and load.
Only use ammunition that is labeled on the barrel of the derringer. Never try to use anything else. If it says 22 Mag, then ONLY use 22 Mag.
The RG Model 66, a revolver manufactured by RG Industries, typically does not have an official .22 Magnum cylinder available. The revolver was primarily designed for .22 Long Rifle cartridges. If a .22 Magnum cylinder exists, it would likely be an aftermarket modification, but such options are rare and may not be readily available. Always consult with a qualified gunsmith or firearms expert for specific modifications and compatibility.
i have a mod tex 22cal lr with a 22 mag interchangeable barrel
A good gunsmith can help you.
Couple of possible reasons- your ammo is a different caliber than the revolver (22 Long Rifle will not fit in a .22 short revolver, nor will .22 Magnum fit in .22 LR) or the cylinder is partially blocked by fouling, rust, etc. Frankly, the RG revolvers are generally of very low quality, I would check the caliber of ammo, clean the cylinder well- and if that does not fix it, I would move on. Value of these is typically lower than an hour of gunsmith time.
just the cylinder change
75-300 or so depending on specifics
Need more info. Model #, condition, exactly which .22 round it takes, ie 22 lr, 22 wrf, 22short, 22 long, or 22 mag.