Well, let me start off with the receivers good points.
It was simple to complete with the drill press, jig and bits provided with the kit
It only took about a hour to complete.
Once the edges are debured the machining looks ok.
Now for the not so good to bad parts.
First, there is a production/design problem with the selector.
I'm not sure if the receivers selector detent hole is off or the jig is off, but the selector positions are misaligned.
When on safe the selector lever is not parallel with the bore.
When the selector is moved to the fire position, it rotates past the 6 o'clock position to about the 7 o'clock position .
The slot provided for the bolt release catch is to wide and has excessive wobble.
This could probably be fixed with a washers/spacers on both sides of the catch lever.
Also, the little set screw that holds in the bolt catch retainer pin is a MO FO to thread in.
The buffer tube detent hole is too tight, when I installed the buffer and pushed the detent down, it stuck and was a b**ch to get it back up.
I reamed the hole a bit and fixed the sticking issue.
The take down pins are slightly off, when installing the lower to the upper, the rear take down pin does not align very good with the uppers holes and requires considerable force to push it through, or to push out.
All in all...probably will work, but they still need some design refinements worked out before I would consider them comparable to an aluminum lower.
Pics are of the misaligned selector in safe and fire position and the to large bolt catch slot.
PICT1336 (924x1024).jpg (202.97 kB, 924x1024 - viewed 4 times.)
PICT1338 (767x792).jpg (192.47 kB, 767x792 - viewed 3 times.)
PICT1334 (1024x768).jpg (188.98 kB, 1024x768 - viewed 5 times.)