Quote Originally Posted by sniper7 View Post
there are lowers out there with the shelf already for a drop in auto sear.

the sear could have been fabricated, could have been bought illegally, or purchased from an M16 parts kit. Either way it would be illegal.
Just wanted to clarify something. A D.I.A.S. is not simply "purchased from an M16 parts kit". It's an apparatus made to use in a receiver that does not have the third hole for the sear that makes full auto possible.

Just wanted to make that connection in case someone is reading this and thinks you can simply order a part that is commonly available that will drop into a semi-auto AR15 to make it fully automatic. D.I.A.S. are heavily regulated as a machine gun by the ATF. To make a m16 auto sear work in an ar15 you would need to modify the receiver to accept the auto sear or machine a D.I.A.S.