Today I spend a little bit of time putting together my testing plan. I want to get an idea of what barrel length bullets will stay sub-sonic. My plan is to start at the factory length barrel and cut it down by 0.1" until it's 2.0" in length and record a number of variables along the way using a couple different kinds of ammo.
I also called up Ruger today to order a handful of ejectors and rivets for the new receivers I'm going to machine for the test barrels. It was about $50 for 10 of each, which should give me a few extra in case I mess up any.
Tore out the LCI, because frankly, who needs that pile of crap?
The next order of business was to take the MK II prints that I was able to find online and turn them into a solid model and print for the receivers that I'm going to make.
This is the print that I started with
And the horrendous looking receiver it yeilds.
Changed the ejection port a bit to be a little better looking.
All the cuts in the bottom.
Wire frame to see all the innards.
Next up will be to find some material to make the receiver blanks out of, find the appropriate take to cut the barrel threads, and then hopefully start making chips.