AFR has a video on J frame lubing and mentioned the UC. Last night I pulled the side plate and didn't notice any debris but aside from what migrated from my initial exterior lubing by shooting and dry firing it was pretty dry, so I lubed the recommended area's and did a shit ton of dry firing which eventually drives my wife nuts but, she's used to it. I swapped grips with my 642 Pro and put the 405's on the UC, dialed it in at 12yds and ran another 100 rd's of Federal GM WC, S&B 158 FMJ and Lost River WC, she's a shooter! I had witness marked the rear sight and found nothing moved without the set screw, I'll bet as noted up thread the dovetail is really tight, I'll call S&W on the screw tomorrow. The trigger has noticeably improved and it's breaking in nicely, the UC has bumped the Pro out of my pocket but unlike the A Holster the Desantis works but it's bulky, gotta see what A Holster can do for the rear sight clearance.