Got tired of messing around with the Marauder Pistol, so the last few day I have been shooting my Sumatra Carbine. I am getting it to shoot a little better but always blow it on the 50 yard target. The trigger is just to hard. Well the JSBs so far shoot the best and are more consistent. Still not where I want to be but getting close. @ 20 yards best 3 shot groups 1/4 ctc. 30 yards 5/16, 40 yards 5/16 (* but most were larger). @ 50 yards 3/4". I did 3 shot groups today because when I tried more shots, I kept blowing it. I had it tethered @ 2500 psi and 890 fps average. I have noticed the barrel has to be cleaned a lot, it starts really opening up after about 30 shots. Is this common? Think if I keep it I am going to have the trigger worked on.