I have a blackbird 3003 that is now just sold to Neil72, and i have to say i was very pleased with it although it does have a slightley heavy trigger, but im sure he will sort it. The top slid is much more comfy to pull back, with no sharpness to it. I did try the old 300 and that did hurt a little when pulled, but this does not. Also on the berut (i think) it seemed to have a longer trigger pull than the blackbird, and when the two were chroned, ( smk did it for me ) the blackbird was doing 435fps and the berkut or whatever it's called was doing 410 fps, so the blackbird is a little stronger. As far as jams go, do what they tell you and it wont. It also seems to shoot pretty constant till the last dregs of gas, then it drops fast, which is much bettr than other guns that lose it slow, with a slow power loss curve. All in all when you have the gun sorted. its better and more 'real' than any of the other clones.