Time for some updates.
Function testing. Everything works, and I cycled 10 dummy rounds manually with no feeding or ejection problems.
However, I noticed that the trigger shoe return / reset was rather weak. In fact, if I held the trigger back (after "firing") and resetting by racking the slide and then released the trigger shoe, it did not return all the way forward... enough to re-engage the trigger safety dingus. No bueno!
This trigger assembly, including the spring was from Rockey Brass and was generously included in the PGB Awards "prize package." I wanted to try to use the aftermarket parts for a change in my "routine."
Here is a comparison of the Rockey Brass spring (top) and an OEM spring (bottom):
It appears the OEM spring has one more coil (16) than the RB spring (15). So, I swapped to the OEM spring. At this point, I kept the RB trigger bar and housing and connector. Gosh, how much of a difference can there be in such a simple part like the trigger spring? Turns out... a LOT. With the new OEM trigger spring, no more weak trigger reset. Trigger safety dingus engages solidly and reliably because the trigger returns all the way.
Next came safety checks and testing. The sear engagement was "adequate," but not ideal. (I didn't get a photo). Drop tests were passed. But I did notice that I could depress the cruciform noticeably (with the slide off) when it was in the cocked position (up on the drop safety shelf in the housing).
Fuck it. I'm changing the entire trigger assembly out for OEM. I've got plenty of them "in stock."
When I rechecked sear engagement... better! (Sear engagement photo tip: Use a handheld flashlight and take the photo slightly off angle.)
When I checked if I could push the (OEM) cruciform down... wouldn't budge! Bueno! Drop tests... passed! (I still cringe when I do it!)
I really wanted to try to build this one with the included RB LPK
@Michele! But it wasn't meant to be. Another RB LPK part that I couldn't get to fit was the slide lock spring during the first assembly of the frame parts. But an OEM slide lock spring went right to place. The bottom line (as most of us know and agree) is that there IS a difference between OEM and aftermarket internal parts.
So far, the Heavy Armor Division UPK parts have worked out - no functional issues that I can find, yet. The only part I changed to OEM (so far) is the firing pin safety plunger / spring. The finish on the HAD safety plunger was a bit rough.
Next will be live fire range testing!