This is a Mossberg Forend known as the Forend, model 95051.
This Mossberg Synthetic Shotgun Forearm requires a 12-Gauge 7.75" action slide assembly and 7.75" tube nut. Compatible with Mossberg 500" 590" 590A1" 535" 835 and Maverick.
Features:
Requires a 12-Gauge 7.75 action slide assembly and 7.75 tube nut
Compatible withMossberg 500 590 590A1
535 835 and Maverick