Sorry to revive such a old thread, but..... I found a good deal on a 20, have been searching the web for info and this is the best, and almost only detailed info I could find. Dan still is the Man, a decade later.

Does anyone know which seal the 20 uses? Is it the same as the 24? Or maybe the 34? Or something different all together? Haven't chronied it yet, not even sure it needs a seal, but I like to have parts on hand.
This is a nice little gun. Simple, good quality, what more can you ask for.

Thanks ACE,
I was hoping Dan would read the post, or maybe someone else could chime in. As I mentioned, this is the only source for good info on the model 20 I could find. I imagine others will look for the same info, hopefully CAF will provide the answers.

I guess I should have just gone to the source as I will likely contact him to try and get one. In my experience, contacting Sniper get expensive fast. It starts with a simple seal, next thing you know you have a new gun and spare parts. Not a bad thing, but my toy budget is low at the moment, this year got off to a good start (or bad if I weren't single).