Further thoughts on the Apex trigger kit - It is as advertised. The actual break and pull weight of the trigger hasn't changed from stock (comparing my memory of how this particular trigger felt stock and to the other stock X-Series FCU trigger I have), which was to be expected since no springs were changed and the sear surfaces weren't modified. It has less than half of the take-up of the stock trigger with less than one millimeter of movement before you hit the wall, and overtravel is slightly reduced as well. For a carry/defensive gun, I'd say the feel is just about perfect.
Further thoughts on the Romeo1 optic shroud - It's tough. It extends in front of the lens of the optic, so unless approached by a convex surface the shroud will take any bumps/hits directly rather than the optic body or lens. I haven't and won't do a shoulder height drop to concrete (at least not intentionally), but I have used the shroud to rack the pistol off a table - It damaged the table, not the shroud.
For the purposes of parts and modifications, barring a decision to send the grip modules off for stippling/frame work, I believe I am at this point comfortable in calling the RS320 completed.
But you all know how it goes when you follow the Hail Hydra school of gun builds;
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"Finish one project - Two more shall take its place..."