Yup that's what happened. So if you have the screw out put er back together and she should work. Cross your fingers, if it still won't work, probably the best thing is a trip to a good old fashoned gunsmith. The good news is, if you have to take it to a gunsmith is the fix isn't real expensive, just a little work with a stone.
Surprises me somebody made the effort to make an adjustable trigger on a 24V. They aren't known to be target rifles. What caliber is the top barrel?? Does it shoot good??