First a single stage trigger. A single stage is the common type of trigger where you pull quite a ways until, at some point, the gun fires. A two-stage trigger eliminates that ambigious "some point" by adding a second stage to the pull. Basically, the trigger "catches" for lack of a better term (really it doesn't catch, it just encounters a greater resistance) towards the end of the pull. When you feel that resistance, you know that the next little bit of pull will fire the gun. One advantage of a two-stage trigger is that if you want a heavy trigger pull (like you would want for safety in law enforcement) it allows for this force to be broken up in two stages of the pull. This helps accuracy. For instance, with a 5 pound pull, you can put 3 pounds on the first stage and 2 on the second. You can aim, pull to the end of the first stage, then exhale, gently squeeze and BANG! Good fun, just like Iron City Blues.
Yes
A two stage trigger has a take up pull then stops, at that point further pressure on the trigger causes it to fire. M14 and M1a, pretty much all gas guns, require a greater trigger pull then bolt guns due to the fact that they automatically reload once fired. Instead of having a 4 - 5 pound pull trigger the designer splits that in two using a 2 stage trigger.
This will vary from gun to gun. An M16 Military rifle has a trigger pull of about 5 pounds, it is a single stage trigger which mean steady pressure on the trigger will release the sear and fire the weapon. A two stage trigger requires the shooter to take up slack in the first stage of pulling the trigger and then apply slightly more pressure to the final process of releasing the sear. In the M14 rifle and M1 Garand the two stage trigger is still about 5 pounds. In hunting rifles most are single stage triggers ranging from 1 to 4 pounds. An Olympic Target rifle or pistol may have a trigger with a pull of just a few ounces, while a combat pistol may have a trigger pull of around 5 pounds. Uncle John Foremost Hunting.com
It depends on the model.
In a firearm, the travel of the trigger can be described as either a single or a two stage movement. In a single stage trigger, there is little appreciable movement of the trigger as it is pulled. As the shooter adds pressure with his or her finger, the trigger is gradually getting closer to the peak force required to overcome the sear (a catch that releases the hammer). This force is measured in pounds and when the trigger releases it is said to "break" at such 'n such pounds. It often surprises the shooter in that until one gets used to that particular trigger, he or she is uncertain when that peak force is achieved. In a two stage trigger, the peak force is divided by stages. The first stage offers the shooter a noticeable movement of the trigger to the rear, with a gradual build up of force. At some point the rearward motion ceases while the shooter continues to add force with his or her finger. This is the 'second' stage and requires just a little more pressure to break the trigger and release the sear. The fist stage is often desired to give the shooter a sense of timing, and in the case of military or law enforcement, gives that last fraction of a moment before having to make a deadly decision. An adjustable trigger may be either single or two staged. Adjustable simply means that the amount of force required to break the trigger can be changed from light to heavy, within a specified range of weight, depending on the intended use of the firearm. Usually adjustable triggers are used in competition where the trigger might be set for as little as 2 or 3 ounces of pull in order to fire the gun. That is not a safe pull weight for law enforcement or self defense for obvious reasons. Most military/LE triggers are set to break in the 4-6lb range. A trigger may also be adjustable for the distance it travels backward and when it resets itself after firing. After you have shot alot, you will begin to notice significant differences, and develop preferences for certain trigger setups and is is then you might find yourself wanting a two stage adjustable trigger. Be prepared with your wallet as they are not cheep, but they are considered by many, to be the best.
I'm not sure why you want a two stage trigger. There are a number of aftermarket triggers available from Timney, Jard, Rifle Basix and DAYTON TRAISTER for the Ruger M 77 MKII. Most require some fitting for the safety cam. Wolf Springs also offers replacement springs that will lighten the pull slightly. BS Firearms Services
two stage thermostat
Two Stage Sisters was created in 1964.
Two stages of a cell are reproductive stage and the growth stage or the energy stage where energy is produced
In a two stage amplifier the gain (ratio of the output to the input quantity) of the first stage is amplified again in the second stage so the gain of a two stage amp is the product of the gain of two individual stages which is sufficient enough to drive the output device as compared to a single stage amplifier.
The duration of Two Stage Sisters is 1.9 hours.
sequencer