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Hi Jermaine, the Defender is not optics ready. A 50rd magazine is here >>> https://usmachinegun.com/products.php?cat=55 If you want to use a drum magazine, you would need to change the grip assembly >>> https://masterpiecearms.com/shop/defender-dmg-grip-assembly-glock-mag-compatible/ This model has a rail for optics and accepts Glock magazines https://www.budsgunshop.com/product_info.php/products_id/147556/masterpiece+arms+30dmg+defender+9mm+side+cocking+threaded+barrel+scope+mount+pistol+semi-aut , . Compatible red dot here https://www.budsgunshop.com/product_info.php/products_id/6997/sig+sauer+electro-optics+sor52001+romeo5+1x+20mm+obj+unlimited+eye+relief+2+moa , . There are also 40rd stick magazines, less expensive than a drum >>> https://www.etsgroup.us/ETS-40-round-9mm-mag-fits-Glock-17-18-19-26-p/glk-18-40.htm . Stay safe & have a great day!

Hi Jermaine and welcome. This model does not have an optics ready slide, this model does: https://www.budsgunshop.com/product_info.php/products_id/147556/masterpiece+arms+30dmg+defender+9mm+side+cocking+threaded+barrel+scope+mount+pistol+semi-aut ---------------------- Compatible Red Dot with Laser here: https://www.budsgunshop.com/product_info.php/products_id/101543/firefield+ff26029+impulse+compact+red+dot+sight+w+red+laser+1x+22mm+obj+illuminated+circle+dot+red+green+black+matte+cr2032+1 --------------------------------- 50rd magazines are not common and are made by welding two stick magazines together which is why the cost is so high: https://www.usmachinegun.com/proddetail.php?prod=MPA50-BOF Cheers, stay safe and enoy!