i just ordered a .22 barrel assy. for my 350 mag from umarex for $98 plus shipping. the gunsmith said it would bolt right up with no alignment problems or gunsmithing required. now i have the best of both worlds....177 and .22 in a powerhouse weapon. these are demo barrels and may have slight scratches at this price. the new ones are $168. ryan said if there were any problems with the demo barrel they would replace with no problem.
if you call umarex ask for ryan.
479-646-4210