First, search the Browning forum "below" using "dot sight". Some good threads/comments. Including mine.
Second, Browning sub-forum at RimfireCentral. Great all-around Buck Mark info. Plus good dot sight threads/comments. Including mine.
Browning - RimfireCentral.com Forums
Here's a pic of my Buck Mark UDX (rosewood laminated grips) "bullseye" target gun.
The "Weaver Rail" for mounting the sight is from Browning (on their site). Bought through Opticsplanet.
The cheap Chinese red/green dot multiple recticle sight is Truglo branded, bought through Amazon. Total of both less than $100.
This combo "works for me" for club matches. Other more serious shooters have good info also. But, more expensive.
Since this picture was taken, I've moved the sight rearward one notch. Allows removel of barrel, rail, and sight as a unit for cleaning.