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It was easy since the footprint and screw pattern is identical to the Romeo. I installed one of sane size Holosun "k" versions. The reason I didn't get the offering with the Romeo Zero factory installed is I wanted something more rugged than an all-plastic sight that is the Romeo Zero. Since I usually carried with a 12 round mag, the extended grip length didn't increase the overall size for me.
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I didn't want the extra length of the XL, which left the X. There are a lot of reasons to purchase an 80 lower. In fact, at this time, it is the only 80 lower available that accept G43 parts. Choose a plain, all-business factory original or an aftermarket slide with any combination of serrations, weight-saving cutouts, a mounting slot for red dot sight. The value wasn't there to pay half of a new gun to replace the slide (I gave the original P365 to a family member not interested in a RDS). This do-it-yourself frame accepts Glock 43 factory parts. Your Polymer80 frame accepts any slide that fits a Glock ® factory pistol with the same-size frame. Of the options available, including buying a new slide and buying an X, or XL version with or without the RDS installed (they both come with an optics cut), I opted to order the X version without the RDS alrwady installed and add my own. In the comfort and privacy of your own home you can assemble your own firearm for personal-use with nothing more than simple hand-tools. Recently I wanted to add a red dot sight (RDS). P80 Glock 17 80 Lower Kit High Strength Polymer 80 Frame Compatibility: GEN 3 - 3-pin 9mm G17, 34, 17L, G22, G35, G24 and G31 Comes with Finishing Jig. Polymer80 is the leading manufacturer of 80 Polymer receivers for the AR15, AR10, and Glock Pistol platforms. I really like the P365 and have had one for years.