This is a Mossberg Synthetic known as the Stock, model 95030.
This Mossberg 500 12-Gauge Synthetic Shotgun Field Stock has a lower comb" which allows a shooter to shoot flatter than a target stock. This is the buttstock only; forearm is not included. This factory replacement stock is made to the exact specifications and features as your original shotgun which will ensure optimal fit and superior function.
Features:
Synthetic material
Swivel stud
Fits Mossberg 500/835/590 and Maverick 88 shotguns