At this time an incomplete nonfunctioning 80% gun component is not regulated by the BATF or DTCC. The purpose of this trigger is for the purchaser to complete the milling process themselves, in their own home, with their own tools, for their own use. At this time the ITF 80% trigger does not require a letter of determination from the BATF.
When completed, this 80% trigger will be able to stop a 2nd round from firing in pull and release mode by keeping the trigger held back and switching the safety selector to the semi-auto mode and then allowing the trigger to reset.
After you have completes your trigger and install it in our rifle you will notice that if you hold the trigger in a certain position there is a .1000 gap that the hammer can move freely from the cock to the firing positions. This can only be simulated when the rifle is not being fired. There is a mechanical process built into the trigger group that eliminates that gap when firing. As the rifle is fired the bolt carrier cocks the hammer. As the hammer cocks, the tail of the hammer contracts and pushes down on the top rear of the trigger forcing the front of the trigger to push back up into the hammer sear. This eliminates that .1000 gap. If you look at the top rear of the disconnectors after shooting, you will see the contact point where the hammer’s tail is pushing down on it.
Use of an M16 safety selector. Intent of use. Up until now the only use for an M16 safety was with an M16 trigger group. If it is installed with an M16 trigger and M16 disconnector the intent of use is for operating a full-auto trigger. If installed with the ITF Multi-Dissconnectors the intent of use is to operate a binary trigger. For example, Nitroglycerin. If hooked to a detonator its intent of use is classified as an explosive. If made into a pill and give to a person with a heart condition its intent of use is classified as a medication.