They are still being made but due to the rush on ammo your lucky to find anything.
Just keep looking, you may find on gunbroker
But you'll pay real high price.
I purchased a TL-RACKER for my shockwave .When I tried to use it the pins that fit retainer nut were to big so I had to remove some material to make it fit. After that everything was a piece of cake
Fellmann:
Thank you for your reply. I held a black aces gun at gun shop.I didn't like the feel of it . I guess I will get a set from Thailand if I don't find any for sale here.