You won’t save money making your own. You need a mill machine, which second hand will cost about $900, and Tactical Machining’s 80% Master Kit jig which sells for $410.
[ Many thanks to jdun1911 for emailing me the link. ]
I founded TFB in 2007 and over 10 years worked tirelessly, with the help of my team, to build it up into the largest gun blog online. I retired as Editor in Chief in 2017. During my decade at TFB I was fortunate to work with the most amazing talented writers and genuinely good people!