“I’m far more concerned about the ATF looking at parts kits for lowers.”
I agree fully with your statement. I have a Franklin Arms Armory binary trigger in two of my AR-15 lower receivers. To get them to run right in rapid fire, I did have to do a bit of tuning with different buffer weights and recoil spring swaps to prevent bolt carrier bounce, but once I got that sorted, they are better than a bump stock for simulated full auto fire. IO can run them reliably at close to a 700 round per minute rate.
I suppose binary triggers will be the next part that BATF deems top be a “machine gun.” I live in Georgia, and I thank GOD that that gun grabbing semi-comnmie, Stacy Abrams did not get elected here.
Actually the ATF is looking at binary triggers right now. I Wouldn’t use one because they are dangerous as chit but I’ll die to protect your right to play dangerous.
Mr. GG2 bobbed the hammer, polished the surfaces on the hammer and trigger and put in green springs on his AR15. But he doesn’t really trust the green springs so he’s going to install an Anderson SS fire control group with a blue spring kit for higher reliability.
My advice to people is stock up on kits now. Otherwise in the future it’s possible you will have to custom order every weapon so the parts are put on the rifles at point of manufacture.