Ah, trigger weights, too heavy, too light, SD or Target, and all points are valid. But lets redefine the question, to safe, versus Unsafe, A safe trigger, regardless of weight, won't go off, unless, deliberately operated. And unsafe trigger, and they are out there, can go off, without deliberate operation, the model 600 Remington had such an issue, a model 700, that is adjusted, under 3lbs, can have this problem, not to mention the 700 recall, whereby, if the safety was on, and the trigger was depressed, it would not go off at that point, but when the safety was disengaged, BANNNNG. Trigger jobs gone wrong, so that the weight of the trigger, is heavy enough to allow it to go bang, 1911's as well as rifles, if set down too hard, should not be a problem if the safety was set before setting down too hard, although with adjustable rifle triggers, it still might happen when the safety is disengaged, so I always check my rifles, by bumping the butt pad hard on the floor ( empty chamber of course ) and I do mean hard, to see if it will fire, both safety on and safety off.
Now to the original question, AR triggers, I will pass this on, as it covers different views, from different directions.
26 May 10
Comments from a colleague who just returned from Urban Rifle Training with
another colleague:
"... a blown-out primer lodged under my AR trigger, rendering the
fire-control group (and thus the entire rifle) useless until I removed the
hammer
and pin, which allowed sufficient trigger-clearance to allow the wedged
primer fall out.
At the Course there were also ARs with 'anti-rotation' trigger/hammer
pins. Since these employ small screws (with Loctite), what was, for me, a
two-minute gun-fix, becomes a tedious, convoluted, exasperating process,
involving tiny wrenches and tiny parts.
Several other ARs had 'packaged-triggers.' These are self-contained,
sealed, and in one drop-in unit. I don't know if a stray primer or anvil can
make their way into such a mechanism, but when they do, it will be all but
impossible to get them out, at least in the field.
Thus, I recommend only standard, military, plain-vanilla triggers on all
serious ARs! The trigger that came with your AR is probably just fine and
should be left alone!"
Comment: Me too!
In the aftermath of the famous Battle of Belleau Wood in Europe in 1918,
Germans described US Marines as "... vigorous, self-confident, ...
remarkable
marksmen!" US General Pershing, went even further, noting "The deadliest
weapon in the world is a US Marine and his rifle!"
Rifles used by Marines in 1918 were simple, even primitive, by today's
standards, yet they made history. German soldiers were terrified!
Marines in 1918 didn't obsess about "target triggers." They had a good
rifle, and it worked.
They made it work!
/John
______________
The author is John Farnham. As a trainer, he sees a lot of what works and does not, and why. I have never had an AR blow a primer, but did on my M1A, luckily the bullet exited, the action did not cycle, smoked the hell out of the magazine, and a quick check showed no blocked bore. Hit the charging handle and off to the races. Only happened once, but a real life moment.
Also, John is seeing more of this, when 5.56 is fired in a .223 chamber.
Back again to the original question, I like the Accuracy Speaks trigger, the trigger nose is cut at a different angle, and that's what makes the difference, honest 3.5lb trigger with no creep, and a lightened hammer, his book is excellent, Derrick Martin, competitor and Gunsmith, the reason AR triggers as supplied from the various factories feels crappy, is the angle of the trigger nose, it is cocking the hammer further on application, just pull your fire control parts out, and mount them on the left side of the receiver with the pins installed, and pull the trigger while watching the operation of the trigger and hammer, it will be real obvious. Next the NM triggers, like Alf said, not real light, but 2 stage and very usable, you might think they are lighter than they are, but they are 4.5 - 5.5 lb pulls, but feel good. Geiselle automatics, a very fine trigger, I have two, including the Super match, that came adjusted to 1.5lbs, 2 stage, 1lb take up and .5lb let off, it really was too light, readjusted to 2.5lbs, and that's real nice. Light triggers are not a problem, unless you run around with your booger hook on the bang switch, then well, yeah, when it is time to shoot, I like a predictable light trigger, My M1a does not have one, and I shoot expert with it, I own 2 rifles with single set triggers and love them, 4lb normal, 8oz set.
As said before, your mileage may vary.