Quote History Quoted:
Well...
It would seem that you printed up an AR 9mm lower without thinking it through all the way, and now it's come to bite you in the ass.
You may want to go get an 100% or 80% lower to use while you figure this one out.
I would say you'll need to use an NFA 9mm glock lower ejector, know exactly where it will need to be dimensionally, and have the ability to mill a slot,
and then to have the ejector captured in some way....via set-screw, or a pin, or...??
New Frontier ejector
https://newfrontierarmory.com/wp-content/uploads/2016/12/C9EJECTOR_0.jpg
.
View Quote
I'll just print more lowers as need be, modify the files in CAD to add the slot and some holes for a few pins and set screws to keep it from wobbling.
Thanks for the tip on the NEA ejector. $3.99 is not much to pay just to help with fitment. I can take measurements from a friends 9mm lower.
Documentation was sparse for this, and I'm trying to figure out, all while "Not knowing what I don't know". I've built 4 AR's in 5.56 and .300AAC, but haven't jumped into 9mm or .22LR ones yet. The lower and how it printed as-is is probably all just for the "Shuty MP1" pistol where most all of it is printed then. On that design, the ejector is in the upper, which would make sense then as to why there's no provision one for a lower.
I think researching through all the various 9mm lowers out there, I got confused, because some websites show theirs without the ejector but list it as included, some have the large angular New Frontier looking ejector, and others have a thin curved finger of an ejector. So I'm correct in now surmising that most all 9mm AR lowers have some kind of blade-like ejector or ejector finger in the web between the FCG pocket and the magwell?
There are probably other variants of this lower file that are set up for a more standard 9mm AR upper. The DEFCAD/FOSSCAD mega-pack is several gigabytes in size. So I'll have to do some more searching in there.