The 4th op is to thread the rear of the receiver for the buffer tub and to drill the hole for the rear take down detent pin and spring and the stock alignment hole. The holes were first cut to the proper size then a thread mill with the proper pitch.
threaded the correct number of threads with the proper pitch.
To accomplish this step a fixture plate was design and machined.
And orientated to hold the part in the correct position.
After machining the actual buffer tube was installer to verify proper fit
The completed receiver is getting closer
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