Our local ranges are dropping 3gun for the most part due to attendance and no help with setup. People locally still enjoy it but with ammo costs still high for shotgun people are opting for 2 gun, USPSA, PRS, or NRL22.
6 moa razor on the open gun
5 moa SRO on the carry optics gun
6 moa DPP on my backup carry optics gun
Easy to pick up in all lighting and can dim it down for overcast if I need to.
I found exactly the same with grams guts and TTI Pads 3 and 4mm both fit my gauge(4 with some pressure) I run them in practice mainly now or if I know I'm gonna drop a heavy mag in a reload. Dimensions were close to my STI gen 2 mags.
They changed the design to a screw in type after the dovetail. I guess it was cheaper.
Have you taken it to a smith and asked if its doable? It looks like the tapped hole is lower than the dovetail cut. Wonder if you could have a new racker made to your preferred geometry and have it brazed or soldered it? Maybe Rokset?
I generally don't rack off the optic just because using the front serrations is so ingrained in me but when I've had some bad loads that were a little long it did give me the extra leverage during stage to clear the stuck round. I just don't want to add stress to something so vital during a stage.
Sometimes I clamp my gopro to a wall or the base of a target stand right before I shoot. Have had zero issues at level 1 matches from shooters or RO/MD.
Ive been running Kimberlin Creek Bullets since they started making them. Some fouling but nothing abnormal. the 125TC are the same mold as blues.......
https://kcbulletcompany.com/
6.5gr wac
1.16 oal
171ish PF
older sti trubor no popples
There will be buildup with any coated bullet(that I've tried so far at least) just gotta clean it every thousand or so so it doesn't get overwhelming. Peroxide and apple cider vinegar soak and scrape works for me.
My load with the 125 truncated Kimberlin Creek bullets (same mold as the blue bullets 125TCs)
6.4 or 6.5 WAC
1.16OAL
S&B SPP
171ish PF
Older STI Trubor no popples