I shot that dime sized group on my old Colt Officer Model ACP Lightweight last week and the trigger is total crap. The optics is a Chinese 2-7x32 special that cost me $29. The pictured gun is the same Marvel Unit 1upper conversion from 2004 is now on top of a steel framed Rock Island Armory 2011 Tactical Commander sized frame that I just got back after the trigger was worked on taken down to about 2 lbs.
The marvel Unit 1 upper came with original target shot in ransom rest grouping 0.60" at 50 yards. I shot from a bag with a crappy trigger and almost matched that at 25 yrds. Can't wait to see it with the current trigger on the RIA. This is porn in my book. Whistle pigs here are gonna hate this gun next Spring. I won't even have to get out of my vehicle.