What I'm looking for: A pinned gas block with bayonet lug, sling point, and a railed top. What I'm finding: Nothing that isn't a clamp type that has an upper and lower unit, something I'm not too fond of.

I'm willing to settle for a railed gas block that's hopefully pinned or at least the slide on type with two clamping screws at the bottom. Why is it so hard to fined pinned anything? It seems like the simplest and most robust method of mounting the gas block and none of us are regularly removing them. Even with the tapered pins it can't be terribly hard to manufacture. What gives? I figured with the wealth of knowledge here on specialized builds someone might have seen a gas block that might fit my needs. Any help would be greatly appreciated, or at least a pointer to a site to browse through lots of gas blocks. No luck at the obvious place, Brownells.