According to the rep., the goal of the design was to create an AR-15/M-16 style subgun that users would be familiar with. You can very much see this in it's appearance. It uses a reduced size version of the piston system they use on their 5.56 rifles. The rotating bolt design lets you shoot nearly any type of ammo, it isn't fussy.
Features:
- Easily convertible to 9mm NATO, .357SIG or .40S&W
- SIG SAUER® short stroke pushrod gas system – reduced recoil, superior reliability and reduced fouling
- Closed, fully locked rotating bolt system – providing maximum safety in case of bullet or water obstruction in the bore
- Monolithic upper receiver with integral M1913 rail at 12 o’clock and free-float barrel system
- Familiar AR-style controls & manual of arms with ambidextrous safety/selector and magazine release
- Rear charging handle will not interfere with rail mounted accessories
- User-configurable stock system: telescoping, folding or pistol configuration for maximum compactness
The stock fastens using a picatinni rail on the back of the lower:
A suppressed version is also available.
Magazine is their own design.
Military/LEO pricing for the non-suppressed version is $1500
The rep. told me that Sig has no plans to release this onto the consumer market in 2013. They will only be focusing on Military/LEO in 2013. That isn't to say that some of our more savvy vendors won't figure out a way to bring them in... Let's hope so!