Gunsmithing the trigger

[golfer]

I am able to find very little information relative to smoothing and adjusting the trigger pull of the M4. The trigger on my DD M4 is a relatively crisp single stage trigger but too heavy and could be cleaned up some.
It seems most people would rather drop in a better trigger, but before I do that, I would rather play with what I have. Can anyone point me in a direction where someone shows how to clean up the M4 trigger pull?
Thanks and best wishes.

[snowdog650]

A simple YouTube search of "polish ar 15 trigger" yields 4,930 results.

I recommend you start there.

[GH41]

And all 4,930 ways to improve the trigger stand a better chance of making it less dependable or even dangerous.

[HelloLarry]

The way you gunsmith an AR trigger is by buying a replacement.

Don't screw around on this.

[AFshirt]

Never could understand why people want precision rifle trigger on combat guns.

[SteveL]

People who screw around with triggers tend to end up with dangerous, unpredictable guns. Drop in an enhanced trigger from Sionics or something from ALG.

[daniel87]

Never could understand why people want precision rifle trigger on combat guns.

Rate of fire

Because i like to have a better interface

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[Wayne Dobbs]

Do NOT mess with the trigger or hammer sear/cocking notch surfaces on the GI trigger, especially if it's a service gun. Buy an ALG or Geissele SSA trigger and drop it in. You'll get what you're looking for. If you mess with the OEM stuff, you'll get something other than what you're seeking.

[MistWolf]

Standard AR trigger parts are case hardened and the depth of the hardening varies greatly. You could get lucky and with a few strokes of your stone and get a smooth reliable trigger, or cut to close to the softer material underneath, leading to excessive wear, resulting in doubling, tripling or even run aways

[lysander]

With the AR trigger, the trigger weight is largely governed by the contact angles. If you look closely at the hammer when you pull the trigger the hammer moves back slightly. This is done so that if you let off the trigger without dropping the hammer, the sear goes back into full engagement.

There are two ways to reduce the trigger weight:

1. decrease the angle on the nose of the trigger, or
2. decrease the hammer spring rate.

Neither are a good option.

Unless you can control the angle of the nose of the trigger to better than half a degree and keep it flat to a few thousandths, you are probably just going to mess it up. If the nose angle gets closer to vertical by more than a degree, you start to lose the reset capability, more you accomplish nothing, either way you eat through the case hardening.

And, reducing the hammer spring tension runs the risk of light strikes on the primer.

The most you can really do at home is polish the surfaces to remove any grittiness.