I have had my Trail NP for a couple weeks now and it had been shooting great for me.* I recrowned the barrel and also done the bearing mod to the trigger as well as going over all the screws and adding loctite, but other than that it is stock.
While shooting last night one shot was really loud and pellet barely left the barrel. After that the POI* was about 6" low and slightly right at 20 meters. Before this happened I was able to keep the group around 3/4" at 20 meters. I have readjusted the sight to get back on target but the groups are much larger now.
I am new to air rifles and was just wondering where I should look first?