Very Nice stock Leo!!
This is mine, and I love it. LGU Master Pro
I had to do some modifications. Because I wanted more out of it, but now it is fantastic. In an indoor range (no wind), it produced a 1.7 inch group at 80 yards, and at 20 yards literally stacks pelleted (0.18" groups). From 18 to 28 yards is pretty much a straight laser beam. The zero is at 25 yards and the latitude POI variation in the 18 to 28 yards range is only 0.25").
The mods I did are: -Trigger was changed to the metal one (from Krale) with two screws.
-Replaced the first stage screw with a longer one then rounded, thermally hardened, and polished the contact tip to a mirror finish
-Polished all sears and contacts in the trigger group and lubed all points of contact with moly
-Shortened the return/reset spring on the trigger(removed 2 coils) to offer a more prominent and faster trigger reset)
-Tapped the back of the trigger guard and added a back stop screw to reduce trigger travel
-Trigger set to 1.2 lbs, with zero creep, and crisp let off and brake ( I could set the trigger to a lighter pull, but I felt that it was a safer decision to leave it at 1.2lbs)
-Enlarged the transfer port from 2.6 to 3.0 mm (reducing the firing impulse)
-Removed and cleaned the factory caked up grease on the piston and in the transfer port (it was detonating and dieseling see original factory condition pic below)
-Added non combustible Krytox lube around the piston seal and a mix of Walther molybdenum, and marine gear grease on the spring (to remove the barely noticeable spring twang)
-Added a 2mm washer in between the base of the plastic spring guide and the spring in order to add a slight spring pre-load (slight power increase 30 fps)
-Added an anti slip grip on the sides (you can see in the pic above)
In all fairness the air rifle was shooting very well from the factory. I did not like the plastic trigger it came with, and of course the dieseling. You do not have to do the modifications, I just wanted to push the rifle to the next level of performance.
-Eric