From DealExtreme, it's a Wii Rifle Gun Prop. The rifle includes comfortable single banded trigger grip or combines with dual handed barrel grip, lock & load, ergonomically balanced and weighted Blaster control system, complete-range motion detection for Wii Remote, maintains natural Wii innovation motion, and is made with hard plastics of high quality.
Its dimensions are 18.11 in. x 5.51 in. x 1.57 in. and it weighs 11.01 oz. The retail price is $16.58.