This is one of my favorite guns. This one is chambered in 9mm. They are also available in .40 S&W and .45 ACP. The carbine comes with a retractable forward accessory rail, and I have added side, top and bottom picatinny rails to which I have mounted an el cheapo laser, light, fore grip, and red dot sight. I REALLY like the Panorama MK-III red dot sight. The only problem is that I can't see the stock sights through it so I would be screwed if the red dot failed or the battery gave up.
This rifle is accurate, affordable to shoot, easy to field strip, and is just plain a hoot to fire. I have no complaints with it.