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A Glock switch functions by applying force to a semi-automatic pistol's trigger bar to prevent it from limiting fire to one round of ammunition per trigger pull. [5] [6] Normally, in a semiautomatic pistol, after firing, the trigger bar catches the firing pin until the trigger is released, but when depressed by the switch it does not catch.
DAO firearms resolve some DA/SA shortcomings by making every shot a double-action shot. Because there is no difference in pull weights, training and practice are simplified. Additionally, the heavier trigger pull can help to prevent a negligent discharge under stress. [10] This is a particular advantage for a police pistol.
This allows for an increased rate of fire. However, the shooter must still manually pull the trigger each time it resets for any subsequent shot to be fired. An image of a forced reset trigger from ATF’s Ammunition Technology Division: Technical Bulletin 22-01. Forced reset triggers are installed through replacement of the trigger control group.
To reduce lock time, electronic trigger systems can sometimes be fitted instead of mechanical trigger systems. Electronic trigger systems are mostly found in high-end match arms and can reduce action time by about 90% or one order of magnitude. [10] At very low lock times the dwell time of the bullet or pellet becomes the most influential element.
An adjustable trigger may have ways to adjust all of these stages, plus trigger location. For example, a first stage or takeup adjustment might include weight and travel, a second stage or sear engagement adjustment might include weight and travel, and a trigger stop adjustment would limit the overtravel.
The end result is a very smooth and consistent trigger. Though the patents expired decades ago, no other revolver manufacturer tried to apply the MR 73 trigger mechanism. The MR 73 requires more than 12 hours of hand-fitting at the factory, making it about 50% more expensive than competing U.S.-manufactured brands. [4]
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The SR9 and SR9c have identical trigger groups. Enthusiast website Gunblast rated both the SR9 and SR9c examples it tested with a factory trigger rearward travel at 9.5 mm (0.37 in). Gunblast rated its SR9 example with a trigger pull of 30 N (6.7 lb f), and Gunblast rated its SR9c example with a trigger pull of 23 N (5.2 lb f).