Tier 1 commercially makes the best sidecar Kydex holsters IMO I have dealt with clones that are better quality though.
I like hybrid holsters better comfort wise myself so I say black arch Protos m is my favorite but I believe there is more innovations left in holster niche.
I've handled a lot of holsters and the Protos M is the most comfortable holster I have experienced, yet the years I bought and sold holsters sidecars have been the most popular. I only seen amateur DIY models of this concept, but I believe there would be a market for this as a convenient...