Hi John, yes sir, the UDX has a picatinny rail for optics. Any optic that will mount to a pic rail will work.
Stay safe & have a great day!

Yes you can. You'll see at the link below.
Buck Mark Plus Stainless UDX browning.com/products/firearms/pistols/buck-mark/buck-mark-plus-stainless-udx.html?srsltid=AfmBOooLl4bMYCDrnzMeMZQCGLNC66-DekFfr

Hi John and welcome. Yes, on the UDX Plus with a picatinny rail such as this one: budsgunshop.com/product_info.php/products_id/23068/browning+buckmark+22+udx+stainless ---------------------------- You would just directly add a picatinny Red/Green Dot Sight no issue: budsgunshop.com/product_info.php/products_id/31619/firefield+ff26021k+impact+1x+16x21mm+obj+unlimited+eye+relief+5+moa+black+hard ------------- Cheers, stay safe and enjoy!

Good evening to you!! The Browning Buckmark Plus UDX .22 is not set up for a direct mount red dot sight. You would need to have a machinist to drill and tap the slide to accept a Weaver or picatinny rail mount. Hope this helps. Have a good rest of your weekend.