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A trigger is a mechanism that actuates the function of a ranged weapon such as a firearm, airgun, crossbow, or speargun. The word may also be used to describe a switch that initiates the operation of other non-shooting devices such as a trap, a power tool or a quick release. A small amount of energy applied to the trigger leads to the release of much more energy.
Most triggers use a small flattened lever (called the trigger blade) depressed by the index finger, but some weapons such as the M2 Browning machine gun or the Iron Horse TOR ("thumb-operated receiver") use a push-button-like thumb-actuated trigger design, and others like the Springfield Armory M6 Scout use a squeeze-bar trigger similar to the "ticklers" on medieval European crossbows. Although the word "trigger" technically implies the entire mechanism (known as the trigger group), colloquially it is usually used to refer specifically to the trigger blade.
Most firearm triggers are "single-action", meaning that the trigger is designed only for the single function of disengaging the sear, which allows for a spring-tensioned hammer/striker to be released. In "double-action" firearm designs, the trigger also perform the additional function of cocking the hammer – and there are many designs where the trigger is used for a range of other functions.

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  1. AMproducts

    Cassette trigger installation - PSA 3.5lb Problem?

    So for one of the more recent sales, (Memorial Day) PSA was selling their 3.5lb trigger for $75 I think, and I've been looking for a better trigger experience for a while, as my main AR build this was going to live in is a 16" SS barrel I use for shooting at longer ranges. I finally got around...
  2. S

    FIVE 0 was i jerking the trigger? XD 40 new trigger kit installed still got out shot By hungary FEG 9mm at 50 yards hits plate

    well dont know about the xd 40 still maybe me jerking ?
  3. S

    Glock Clone KIGER Anderson gets a 3ld trigger ghost kit install shot great 50 yards

    yeah that trigger is nice now
  4. S

    7.62 x 39 FMJ wolf penetration test large block of wood Sr40 pivot trigger pin fell out

    going to get another pin on ebay Loctite that in next tiem
  5. S

    ar-15 Alex pro 700 yards Crazy trigger double taping not resetting & mount isuues

    wow ok i fixed the trigger i think shim both sides if the sear the trigger was wobbling some i found out and the mount was really off took it off and bore sited it in for next time
  6. Burnside

    National  ATF Charges American FRT Trigger Owner For Illegal Possession Of A Machine Gun

    Mr Gunsngear talks about ATF injustice when it comes to FR trigger packs
  7. 1971Chevelle

    Wilson Combat Glock Trigger

    I have a Wilson Combat Glock trigger (model number 944). I have not had any success getting it to work properly in 3 different firearms. Now, it has only been tried in P80 lower, but that should not make a difference. I am using an Apexx trigger in two of them with no issues, and what I think...
  8. B

    Binary Trigger Instal

    Hey guy’s. Is anyone interested or know of a gunsmith who can instal my Franklin 10-22 binary trigger as well as my Fostech AR15 trigger? Anyone tackle that job themselves and share their experience? TIA B Free
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