Air Arms TX200 Mk III Air Rifle Spring-piston Underlever Single-shot Sliding breech cover exposes loading port during cocking cycle 2-stage adjustable match trigger Lothar Walther barrel 11mm optics dovetail grooves No open sights Beech Monte Carlo stock Raised right-hand cheekpiece Checkered forearm and pistol grip Ventilated rubber recoil pad Shrouded barrel