With the last test model machined I started putting the lower together and a number of issues were noted. The receiver dimension is correct for the holes, magazine release, magazine well and overall length and width. the magazine button and release lever are not deep enough.
These are the noted problems.
The first one is a very slight radius issue on the rear of the receiver just prior to the buffer tube
The second issue concerns the magazine release lever. this needs to be cut deeper to allow proper fit.
The third issue deals with the hole for the selector. There is a slight inset in the receiver to all the selector to set properly and this needs to be cut in. This is how it looks on the original.
And you can see it is missing on my test receiver.
The last issue is raised portion of the receiver around the magazine release. On my receiver it extends to far over and does not line up with the upper receiver properly.
With some minor changes to the machining program I hope to correct these issues.
still amazed at how much work goes into this thing