Mossberg 500 to Holosun K/EPS/EPS Carry/407K/507K/Vortex Defender CCW Steel Red Dot Plate Model:4 Screw --- (Measurement from the bottom

--- (Measurement from the bottom of the plate to the mounting face of the optic not the overall thickness

Q: Is this plate compatible with the Defender ST/XL

Holosun 509T

Customer service was great called them for torque specs they stopped there day to help me

Q: Is this plate compatible with Holosun 407K/507K

Mossberg 500 to Holosun K/EPS/EPS Carry/407K/507K/Vortex Defender CCW Steel Red Dot Plate Model:4 Screw --- (Measurement from the bottomMossberg 500 to Holosun K Defender CCW Steel Red Dot Plate Steel Adapter Plate for Mossberg 500 & Holosun EPS EPS Carry 407K 507K Vortex Defender CCW Enclosed OSight S *Make sure to select the correct optic because the screws are different* PRODUCT OVERVIEW This steel adapter plate enables the seamless mounting of a Holosun EPS EPS Carry 407K 507K Vortex Defender CCW red dot sight or any optic with the same footprint to your Mossberg 500 Shotgun.