If you have never used a router or a mill to shape aluminum, it is a learning curve to get to where you want to be. The 5D Tactical jig is not cheap, but it is a quality piece of equipment that if you pay attention to the instructions & go slowly with the milling till you get the hang of it, your finished product will equal a 100% without all the engravings & transfer fees.
Don't force anything & there are some neat tricks as to using it that will make the bit last longer & the job go quicker. Some guys can get a few receivers done before the bit is damaged & has to be replaced. I have seen millends/bits that last thru many dozens of receivers if you pay attention to the task @ hand. The completed receiver's finish internally & the location of the pins & FCG are spot on.
The jigs are not designed to do commercial work as they are a hobbyist tool & if you are making them commercially, you need a shop, a CNC mill & a FFL for manufacturing. For those who want to make a few receivers for themselves to say, look what I completed & make their own guns, the 5D jigs are perfect & then sell it when you are done.
EDITED to correct name of Jig, the company is not 3D Tactical