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It will attach. As far as fitting flush, it will stick out a little from the muzzle. Stay safe and have a great day!!

Matthew, this will fit the Rex Delta 9mm no issue. A micro unit may be more ergonomic : amazon.com/Flashlight-Function-Magnetic-Charging-Green-Laser/dp/B07R7J3643/ref=pd_sbs_469_4/140-2119735-1791930?_encoding=UTF8&pd_rd_i=B07R4G6G85&pd_rd_r=ea5d1c8a-d37a-4940-aa02-de5c734bfe7c&pd_rd_w=LRBMe&pd_rd_wg=G59en&pf_rd_p=d28ef93e-22cf-4527-b60a-90c984b5663d&pf_rd_r=WWEFQT76EJWY2DQ8146Y&psc=1&refRID=WWEFQT76EJWY2DQ8146Y

Yes it will "fit."