AR Trigger

[dfletcher]

I've bought a few extra stock AR triggers (in theory for more builds) and have decided to experiment. I don't profess to be a great gunsmith, but I can drill & tap and can tune Smiths and Colts and 1911s and do what I think would be intermediary level work on many guns. I know my limits, any suggestions on why this would not work (or how to better make it work) are appreciated.

On a single stage AR trigger the sear is on the front of the trigger - ahead of the trigger pin - and engages the sear notch in the hammer. Pressing the trigger pivots it down from the hammer's sear notch. The greater the engagement of the sear and sear notch, the heavier (or longer) the pull and of course the reverse is true.

The tail end of the trigger (behind the disconnect) has sufficient space to drill & tap a single hole through which a small allen screw can be inserted. Turning the allen screw down (against the bottom floor of the AR lower) raises the back of the trigger, which of course lowers the front and lessens the sear engagement. With the upper removed and a long allen wrench, the trigger can be adjusted.

First, has anyone done this & what were the result and 2nd - is there any reason this would not work? The only concern I might have is would a steel screw score the softer aluminium floor area of the AR lower after repeated trigger pulls? I think this can be worked around with a steel sheet tab if it's an issue. I realize I could side step the problem by putting the adjustable screw into the lower instead of the trigger, but I really don't want to drill away on the receiver and that also makes trigger adjustment more difficult.

Good, bad - old news?

[aplinker]

Sounds like you're doing just the opposite of what Superior does with their infamous "automatic machinegun lowers."

Look here

http://www.rbprecision.com/id74.htm

[dfletcher]

I guess the principle is the same, just pushing from a different position. I noticed there is a company selling a grip screw with a threaded sub - screw that does the same thing from below. But I don't want to spend $40.00 on a single screw nor am I comfortable with the finer points of a trigger pull being determined by how tightly I sock down my grip.

[aplinker]

I guess the principle is the same, just pushing from a different position. I noticed there is a company selling a grip screw with a threaded sub - screw that does the same thing from below. But I don't want to spend $40.00 on a single screw nor am I comfortable with the finer points of a trigger pull being determined by how tightly I sock down my grip.

I'm pretty sure the grip screw to which you refer just has a drilled/tapped center of the grip screw that you put a set screw into. You tighten down the grip, then tighten the set screw for the trigger.