I put a Vortek piston seal made for a Diana 34 into a Chinese springer and after fitting the seal to the chamber, the gun shoots just fine. You should not have a problem with aftermarket seals.
first remove the cross pin in the trigger blade, now replace it with a 1/16 inch rod or drill bit, using a small pin punch at 90 degrees from the flat inside the blade, tap a mark to guide the drill bit. Now drill through the blade at 90 degrees from the flat using the correct size bit for the size screw you will be using ( I use a 4-40 by 3/4 inch) tap hole from the top and run the new screw with a lock nut in from the bottom until the end is just at the top of the two holes left by removing the cross pin. Polishing the tip of the screw is needed. To adjust the release weight turn front screw in 1/8 to 1/4 turn at a time and adjust rear screw for length of travel in first stage. Adjusting the rear screw may require you readjust the front one. DO NOT GO EXTREMELY LIGHT ON RELEASE WEIGHT. There will be wear over time and the rifle may fail to latch properly if release is to light resulting in reverse droop for break barrels....I have done hundreds of these mods and with correct adjustment it will improve the feel...just don't go for a target weight triggermailto:firstname.lastname@example.org Flying Dragon Air Rifles 515-924-3699
So the RWS TO6 trigger is a bolt in on the Redhawk/Blackhawk?