content: But, I think the background checks and such are a good idea. This just seems dangerous.  Thing is, this machine isn't exactly exclusive to the company selling it. There own there are plenty of other ways to go about making your own lower receiver without it. Short of banning metal working tools and machinery someone will always be able to do it. It's just another way to exercise you 2nd amendment right, and for personal use, I fully support others right to do this.  With the hundreds of millions of guns in circulation already, criminals are already bypassing background checks.  Of the guns used in crime, those legally bought by a criminal who went through a background check are 11%, so background checks already do little to nothing. By far most are being obtained from friends/family or other illegal means. While I can see the potential for someone using it to get a gun when they are not supposed to, this is not how the vast majority of criminals are getting guns used in crime. As far as I can tell the people doing this sort of stuff are mostly law abiding gun owners, and maybe i'm over generalizing, but personally I feel that those that know how to machine/assemble there own firearm know better than to go out and commit a crime using it. Either way banning a cnc machine that can create lower receivers, could lead to  slippery slope. Do we start banning the sale of all metal working tools/machinery?