This is for the Compact II 22 Caliber ONLY, I got one and it was shipped with a CZ barrel, With much much effort I got the barrel out but you could not get the barrel back in, Now three of my Prophet I barrels fit no problem, So RTI sent me another CZ barrel, same problem, Where the two O rings are is just a thousands to big, , What to do no answer from RTI, So I get the sand paper out and by hand I very slowly rotate the end barrel , I do this for hours I kid you not trying to fit barrel in every hour or so of work, OK barrel fits now, Did the same with the 2nd barrel but I ported the port and got it a nice oval, What a pain in the A S , Did not get a chance to test the ported barrel yet, But with the 177 LW barrel tune Reg set at 100 bar shooting 10 gr pellets at 930 FPS , Dropped in the 22 barrel and no change to tune shooting the 18 gr JSB pellets at 900 to 910 FPS, Have to test out the ported barrel soon , Anyone want pictures? Accuracy oh my I think they sent me a hand picked barrel, Accuracy is that good, I am impressed big time.
Mike
Mike