The upper and lower receiver as well as the trigger guard are steel, and the pistol-grip and handguards are all made from polymer.

The ambidextrous safety/fire selector switch, as well as the interchangeability with SIG 552/553 handguards are a feature found on the latest versions.

The 9mm magazines use a transparent plastic made from polymer,[4] allowing the number of available rounds to be determined visually.

[6] It has a short 4.5-inch (110 mm) barrel, no shoulder stock (although the left-side-folding tubular metal buttstock of the standard SAF can be attached), and a vertical foregrip.

It includes a new retractable and foldable stock, a new handguard and Picatinny rails provided for modern optics and lateral attachments.