Quote Originally Posted by austinN4 View Post
The whole purpose of the serialized Fire Control Unit is so the rest of the components can be modular. I can own one FCU and build multiple handguns around it - grip module size and type, caliber, slide, etc. I like it that way and it is why I bought a P320.
Everyone understands the purpose, but now ATF has an entire new way to declare a fire control group to be a firearm. Pretty soon any and all parts will be declared "firearms" and that is what I object to.