I am curious regarding your rather negative experience with the R18, as you definitely appear to be an outlier if you are experiencing parts breakage and stoppages with the rifle. That directly contradicts my experience, and that of other folks I know as well, whose R18s are all rendering stellar service. Could you please elaborate on which parts have broken and what type of stoppages you have been primarily experiencing? Not to insult anyone's intelligence, but if you are not accustomed to "balancing" a rifle with an adjustable gas system, that can be tricky the first few times. Just throwing that out there, as you are fairly new to CGN you may also be new to gas-adjustable firearms as well, we don't know. In any case, I'd appreciate hearing more specifics regarding your rifle's failures.
Have you reached out to Mike Scottt at Sterling Arms International in Calgary? 1-(780) 722-1917 - he will sort your rifle out under warranty.
Mark C