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The Trigger

Overview

Information on the airgun trigger including use, care, and maintenance.

The Trigger

The majority of adult spring piston airguns have what is known as a "two stage" trigger.  The first "stage" is merely a predetermined amount of take-up or slack preparatory to the last or "second stage" which is the let-off or actual firing stage.  This is a European custom and is designed to aid the shooter to embrace and steady for the discharge of the rifle. 

The trigger pull setting as it comes from the manufacturer is usually the best for the airgun in question and should not be lightened.  A good trigger pull for an adult airgun is about 3-6 pounds (1300-2700 gms).

Trigger technique: Assume a normal standing or rest position, take a correct sight picture.  Now take a normal breath, hold it, and then squeeze the trigger.  Do not jerk or slap the trigger.  There is no substitute for practice.  Happily, with an adult airgun practice is easy and inexpensive.  For details, consult a recommended book on match shooting techniques. 

 

WARNING! Modifications and/or tampering with a trigger mechanism may cause an airgun to malfunction and become unsafe to use.

 

CAUTION: do not use oils or solvents intended for firearms or other devices in the compression chamber of any spring piston airgun!  to do so can cause severe detonation or "dieseling effect, " resulting in possible damage to airgun and injury to the shooter and/or bystanders.

 

Only special lubricants specifically designed for spring piston airgun compression chambers should be used.  These are sophisticated designed for spring piston airgun compression chambers should be used.  These are sophisticated silicone oils specially formulated for the purpose.  Of the hundreds of silicone oils available, only a few have the proper flash point, viscosity , lubricity, lack of acids, etc., for use in the fine quality spring piston airguns.  Incorrect lubes can be dangerous.

 

The reason for this is that during the firing cycle of a spring piston airgun compressed to quite high pressures, resulting in high temperatures for a fraction of a second.  This heat can actually explode any vaporized flammable oils in the chamber.  Very light dieseling is often experienced with a new airgun that has not been "broken in".

 

The manufacturer oils and lubricants can cause minor dieseling.  The airgun may make a loud "crack" and give off some smoke.  Usually this stops after a few dozen shots and the airgun settles down to its normal pressures. Sometimes it may take a tin or two of pellets before the excess lubricants are cleared.  A wisp of mist or smoke after shooting is not cause for alarm and is a sign that your airgun is getting some vapor lubrication into the barrel, a good thing.

Typical Spring Piston Mechanism

Note: This diagram has been simplified for clarity, the airgun is shown in the cocked position.  In a Gas spring airgun the "mainspring" consists of a sealed unit of compressed gas.

airgun piston spring.PNG

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