This is a Ergo Grip Stock known as the F93 PRO Stock, model 4925-DE.
ERGO's F93 Pro Stock AR-15/M16 is an eight position collapsible stock for AR style rifles and shotguns. It provides one of the longest length of pull on the market with a fixed cheek piece for a constant and repeatable cheek weld in any of the eight stock positions. Once the butt is locked into position" the F93 has the feel of a fixed stock without the rattling and movement shooters are used to. Includes an over-molded carbine length buffer tube" standard castle nut" ambidextrous sling plate" rubber-like recoil pad for enhanced comfort and secure" positive placement" 2 quick detach sling attachment points" 3 web sling attachment points and 2 sling hook attachment points.
Features:
8 inches from receiver to butt plate when collapsed 12 inches when fully extended;Weight is only 1.3 pounds;The Strike Plate (4980) is optional
