I've sighted the Discovery in several times now. I've been fiddling with mounts and different scopes. I should have ordered my mounts from Tim at Mac1 because mine shoot very low. I changed them front to back and measured them they are identical. I've heard the ones Tim sends are slightly different height. That would have been a help but I learn the hard way. It took three pieces of aluminum soda can shim added to the bottom of the rear mount to correct the problem. I finally decided to sight it in at 30 yards using a machine rest I have. The gun is strapped into the rest and moved with knobs to adjust point of impact. It also has a syringe style pneumatic trigger actuator. That way no outside external forces on the gun during firing I just check the scope occasionally. This is what I got starting at some shots just to get it on target and progressing to it finally settling down. There is a little play in the scope adjustments but additional firing settled the cross hairs. The gun is extremely accurate more so than most shooters I'm sure. It makes me wonder why other adult air rifles cost so much. I will say both my Air Arms S410 ERB and my FX Monsoon will shoot slightly better and have better triggers. But trying to justify the additional costs of those guns compared to the Discovery is difficult. I like the looks of my other airguns and their fine workmanship. But if I wanted a very good PCP air rifle at a very reasonable cost the Discovery is the gun to buy. I've been doing some plinking with it shooting paint balls off of golf tees at 40 yards. I find this to be a very good test of a guns ability to group. This gun excels at performing that task. Now to get a recoil pad to lengthen the stock and I'll be all set. An excellent hunting and target gun at a very affordable price.First sight-in target. Six shots to get me close.
Second sight-in target. Six additional shots minor adjustments.
Third and final target. Three shots sighted in.