This is a Walther Striker Fired known as the PPQ M2 chambered in 22 LR, model 5100304.
The PPQ . 22 is the best of both worlds. By combining smooth-shooting" ergonomically-advanced components of the PPQ with the fun and cost savings of . 22 rimfire" you have the pleasure of shooting shot after shot both accurately and affordably. The sculpted grip meshes smoothly into the hand. The trigger is the finest ever on a polymer handgun. The styling is elegant and trim.
Features:
Ambidextrous Magazine Release
Front and Rear Slide Serrations
Picatinny Rail
Threaded Barrel