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Hi Stanford and welcome. It is but the rear sight is installed. This would be 100% reliable with the OpSol Mini-Shell Adapter here: https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish --------- Cheers and stay safe!

Hi Stanford, this is mini shell compatible with the OpSol adapter budsgunshop.com/product_info.php/products_id/36595/opsol+texas+mini-clip+mossberg+500+590+maverick+88+polymer+black+miniclip , The receiver is drilled & tapped for optics. Here is a rail that would fit (you would remove the rear sight) budsgunshop.com/product_info.php/products_id/104683/mossberg+picatinny+rail+1-piece+fits+mossberg+500+505+510+590+590a1+535+835+930+935+metal+black , I have the Romeo5 on my slug gun budsgunshop.com/product_info.php/products_id/6997/sig+sauer+romeo5+1x+20mm+2+moa+red+dot+sight , Stay safe & have a great day!