I've been using the R1 for a few years now.
I didn't know these made it here with a 20" so I guess I'll have to start shopping around now!
My only recomendation is to keep the piston clean (and even remove the snap ring and clean under the ring attatched to the piston. It took around 3000 rounds for the piston to disolve. I then got a new piston assembly thru warranty. I've used it three times, and cleaned it after each time and it is already showing signs of corrosion.
Have fun with it, and let us know how the accuracy is.
I didn't know these made it here with a 20" so I guess I'll have to start shopping around now!
My only recomendation is to keep the piston clean (and even remove the snap ring and clean under the ring attatched to the piston. It took around 3000 rounds for the piston to disolve. I then got a new piston assembly thru warranty. I've used it three times, and cleaned it after each time and it is already showing signs of corrosion.
Have fun with it, and let us know how the accuracy is.