I've seen the color episodes for decades in syndication. They are okay. But I've found I like the 30 minute Black and White episodes you describe FAR better. They are gritty, more realistic, filmed outdoors, Matt is a lot tougher (more like Robert Stack Eliot Ness in the West), to the point, not a whole lot of dragging drama and dialogue that later came with hour long episodes in color.
I have seasons 1 and 2 and first half of 3 on DVD. Like you, I saw a couple of episodes at noon on MeTV this week. They actually had a Christmas episode where Chesters cousin comes to town. Simple mountain man hillbilly. A crazy Bob Ewell with long white hair goes crazy on a Christmas party at the Long Branch.
They seem to pay more attention to details about guns and holsters there too. Usually people carry a .45 Colt and a Winchester but occasionally you'll have others like Buffalo Hunters carrying a .50 Sharps carbine or somebody with a Colt Navy .36.
Did you notice the holster in the opening draw that you mention seems to be a 5.5 inch barrel holster but when he pulls the gun its' a 7.5 inch barrel gun?