Been trying to get (afford) one for the last 4 years.

Airforce Talon with lots of mods:
Walther .20 barrel with target crown.
Custom brass breech with duro 90 o-rings
Custom silencer
Custom self lubing fosfor brass heavy hammer (80g)
Doing 30ft/lbs with 24gr pellets.
20mm (5shot) groupings @ 78yards
Optimum fill @ 170-140bar.