Yeah... saw that, too. Looks pretty good. Hopefully, the housing will sit in there properly... and all the pin holes line up.
View attachment 9611
Okay. I can't keep quiet on this anymore.
Who here runs the modified Gen 4 Trigger Housings in their Gen 3 frame? I've got *a few* I started testing, even before the OEM Gen 3 THs became unavailable for months on end a few years ago. The first one I did was done before it was a known thing to do -I mentioned it back on MGB's Forum (and got my ass chewed by another member for mentioning it, but MGB supported me on the innovation), and a couple of months later Brian P. made the mod a public thing. I have not experienced ANY problems (yet), and I know that there are MANY MANY Builders who went this direction too.
I have long criticized this mod however, because the bottom rear arch of the Trigger Housing is completely unsupported inside the frame -zero contact! The ONLY thing keeping a Gen 4 Trigger Housing aligned is contact across the front wall of the pocket (which is also the rear wall of the magwell) and the Trigger Housing Pin. That tiny 3mm Pin. I have long asserted that eventually the TH could deform and start rocking in the pocket, and then Sear Engagement could become compromised, the pocket/magwell wall could start receiving undo stress and break (YES, this has been documented as happening
once that I know of -this is anecdotal evidence and who knows if other issues in that frame or Build contributed to the failure, but that frame is broken now -possibly all over an $8 Trigger Housing). For me, I did it as an experiment, a test. I KNOW what the potential failures are, I KNOW to keep a look-out for them.
Okay, so what does that matter here? If the grid isn't removed completely, the Trigger Housing won't sit in properly -pretty easy to tell that, and not hard to correct. Get in there with a small scraper to flush-down those ribs, take a few extra minutes to do it right. Something like these might work well:
Details Mini Scraper Set for Creating Delicate Details High-quality scrapers for removing paint and other materials from models and other surfacesIncludes 4 scrapers in a range of sizes and shapes for a variety of optionsMade of dropped forged hand-ground in surgical stainless steelSuitable for...
www.micromark.com
BUT OH NO!
You slightly over-scraped the bottom arch of the pocket??!? So what. If a Gen 4 Trigger Housing can function reliably in a Gen 3 frame with ZERO arch contact, a rough, gouged, or scratched-up arch isn't going to be any worse. If you absolutely must, apply a THIN coating of epoxy, and before it fully sets up, drop the Trigger Housing in to 'mold' the epoxy -now you have even better contact than a 'regular' frame.
This isn't that hard. [Shrug]