The M-20 SD is a feature-loaded ergonomic and Double/single-action rimfire pistol. It sports a machined aluminum slide allowing for use of both high velocity and standard velocity ammunition. Features include slide serrations front and rear hammer de-cocker textured grip and slide-mounted safety. These features combine to make for a smooth and enjoyable shooting experience. The SD model gets the addition of a threaded barrel for the attachment of muzzle devices. Hello Suppressors. Hello compensators. – SPECIFICATIONS: – Barrel length: 4.75 – Overall Length: 7.8 – Threaded barrel – Trigger Pull: 4lbs – Manual Safety – Overall weight: 1.4 lbs – Double Action / Single Action – Hammer Decocker – CNC machined Aluminum slide