99% of the time the reason these guns don't work is that they have not been cleaned, they are full of cosmoline , take the slide off and the grips and soak over night in a pan of kerosene,diesel fuel , or paint thinner ( do not soak the grips in the pan) spray down with brake cleaner or WD40 , whip it down and re oil and put a little grease on the rails
, then gun put gun back together ,
(there are other was to take cosmoline off of guns but it is must be fore you ever shoot the gun's and rifles)
NORM