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Hi Frank I use the Burris Fastfire 3 on mine. It's perfect! https://www.budsgunshop.com/catalog/product_info.php/products_id/79679/Burris+300234+Fast+Fire+III+Reflex+w%2FPicatinny+Mount+Univers

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You will need this too https://www.budsgunshop.com/catalog/product_info.php/cPath/26_2092/products_id/411556957/Millett+Shotgun+Saddle+Matte+Winchester+1400%2C1500%2C12+Gauge+Clam

here is what you need Sun Optics USA Shotgun Rail Winchester 1200-1500/SXP 12-ga Saddle Scope Mount https://www.amazon.com/Sun-Optics-USA-Winchester-1200-1500/dp/B002VZ6EYS

Since the SXP Defender is "Drilled and Tapped" the "One Piece Weaver" Mount will work: https://gun.deals/search/apachesolr_search/076683483379?upc_only=1 ----- Along with (or any Red Dot of preference) : https://www.budsgunshop.com/catalog/product_info.php/products_id/85124/Bushnell+AR731306+TRS-25+1x+25mm+Obj+Unlimited+Eye+Relief+3

Hi Frank I use the Burris Fastfire 3 on mine. It's perfect! $206 with Price Match - https://www.budsgunshop.com/catalog/product_info.php/products_id/79680/Burris+300235+Fast+Fire+III+Reflex Here is the video - https://www.youtube.com/watch?v=opbxdT62T3I

I could not find where the SPX defender is "drilled and tapped". I suggest contacting Winchester to verify that it is drilled and tapped at (800) 945-5237 if it is not here is what you need Sun Optics USA Shotgun Rail Winchester 1200-1500/SXP 12-ga Saddle Scope Mount amazon.com/Sun-Optics-USA-Winchester-1200-1500/dp/B002VZ6EYS