Mini Comp front sight HiViz PM2011
Screw attach bead replacement.
Check if it fits your model on the HiViz US website shotgun selection guide chart - HIVIZ® Shooting Systems | Manufacturing high quality firearm fiber optic and tritium sights » Product categories » Shotgun Sights (hivizsights.com)
Smaller alternative to the CompSight PM1002
Fits most ribbed shotguns with removable front bead