Update: I picked up an 80% raw C9 lower from Joeboboutfitters. This lower should accept Glock 9mm and .40 magazines. However when I got mine, my G23 Gen 3 magazines would not insert into the magwell fully. As a matter of fact, if I would push it too hard it would almost get stuck to the point where I could not remove it.
I contacted New Frontier Armory and they had me send this lower back to them to check it out. Via email they told me they were going to send me a lower where the mags they tested at their facility dropped free and inserted no problem. However, when I receive the replacement lower, I had the same problem in that my G23 mags would not insert into the lower. Had the same problem with aftermarket KCI extended mags as well made for Glocks. These KCI mags work in my G23 pistol. In order for my G23 mags et al to fit properly and drop with the NFA lower, I had to do a substantial amount of filing in the magwell to make it work. Until I get the upper built and the lower milled, not sure what the functionality will be of the lower. It may turn out to be a $113 brick. Additionally, milling jigs from Range Tool and 80% Arms will not work with this lower unless modified to fit.
I should have went with a QC10 lower along with parts/pieces but was interested in trying the 80% route along with trying to save $ since I've made several 80% AR15 lowers in the past. Probably should have looked at the RRA LAR40 a bit more as well. Lesson learned.
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