I bought one of these as it is unique, but after about a thousand shots the trigger stopped. It would not activate anymore.
I took it apart only to see it was a horribly cheap sealed unit, not worth the $120-150 that these things sell for.
BEWARE,,,, if you buy this gun it has a VERY short life span. It's really a cool design and fun as hell to shoot, just not too much as it's just 2 sides clam shelled over a pot metal insert that is very unreliable.
VERY CHEAP- REALISTICALLY SHOULD NOT COST OVER $50
Hopefully in the future Umarex will offer a better quality semi/burst BB rifle, but for now, My Crosman 1077 rules..!