JG Airguns Custom Tune for Spring Piston Air Rifles.
Tuning an airgun does not necessarily increase the velocity unless there are issues such as a broken or fatigued spring, a damaged seal, or a rough chamber wall, out of round compression chamber, etcetera. The purpose of tuning is to maximize the efficiency of the gun, make it a smoother, more accurate, with more consistency, less spring vibration and twang, and reduced recoil, therefore, more enjoyable to shoot.
Lower end guns, especially in the Chinese and Russian air rifles using synthetic seals, have seal damage right from the factory assembly process. Often the buyer will never know, even while shooting it, unless it is extremely bad, has a Chronograph, and experiences some damage, like breaking a mainspring. Little or incorrect lubrication, poorly fitting and low quality mainspring, poor quality control during manufacture and assembly, rough components, causes excessive vibration, spring twang, excess spring torque, inconsistency, lose of power, inaccuracy. We have even seen mainsprings on new guns coming in from Turkey, China, and other countries that do not have the end coils finished. Tuning usually corrects most of these problems and improving the trigger pull can add a lot towards improving accuracy.
Spring twang or vibration and cocking roughness can be caused by roughly finished metal on the interior parts caused by poor machining and stamping. Cocking a spring piston air rifle causes the mail spring to increase in diameter and twist, and if the spring guides are poor fitting allows the main spring to cant or bend. All of which rob power when the gun is fired. When a spring piston air rifle is fired there is a double recoil. As the piston moves forward in the compression chamber it bounces rearward off the compressed air ahead of it before the pellet starts to move, (that is why pellet skirts are larger in diameter then the pellet head, to hold the pellet in the chamber long enough to allow the pressure to build up at this point). At this time the spring free floats, in other words, both ends are not touching either end of the compression tube or inside of the piston. The spring quickly comes to rest on both ends, unwinding and causing the gun to twist to the right or left depending on which way the spring is wound. Then when the piston hits the bottom of the cylinder, it drives the gun forward. According to the laws of physics, for every action, there is an equal and opposite reaction. A tune helps reduce much of this violent reaction and makes the gun more controllable. The above firing cycle is why we do not work on gas ram airguns. The piston hits the end of the compression chamber with out bouncing back off a cushion of compressed air and can cause stress cracks in the compression chamber or damage to the compression tube in the rear where everything is secured together.
Tuning reduces spring vibration or twang (by polishing the ends of the spring, adding thrust washers, polishing the spring guide). Tuning can also increase power, and makes for a smoother cocking operation. In addition, there is a softer more predictable trigger pull if a trigger tune is done. Another important result of a good tune is far less recoil, less twist (torque), more consistent velocity, and smaller shot groups.
Seals are soft and considered wear items and are expected to wear, by design, they are intended to wear and protect the metal parts, similar to break pads on a car wearing instead of the rotors. We use nothing but the best seals and spring available for a given gun.
Proper lubrication is of the utmost importance. How it is lubricated, at what points, and what lubricant is used makes a tremendous difference how your gun behaves, its accuracy, its consistency, seal and main spring life. Its important to know that there are several lubricants used in airguns for different purposes in different locations and they all have specific purposes. We use an assortment of proper modern lubricants designed specifically for airguns.
Tuning should resolve many issues with a new or used air rifle and result in owning a more enjoyable air rifle. Please keep in mind, no two guns are the same coming off the assembly line, or tuned by the same tuner, have the same power, consistency, and accuracy. Secondly, power should not be the primary concern, although important. If a tuned gun and turns out extra strong, thats fine as long as it fires smoothly and is consistently.
What you get with the JG Airguns Custom Tune:
- Polish the ends of the main spring,
- New piston seal,
- New breech seal,
- Proper lubrication through out the airgun
- Deburring and polishing of the piston,
- Polish the existing spring guide.
- Thrust washers at the rear of the main spring, if possible.
Custom Tune price is $100.00
JG Airguns Custom Tune Plus for Spring Piston Air Rifles
Everything for the standard JG Airguns Custom Tune plus:
· Custom machined to fit Nylon* or Delrin* spring guide, these protect the mainspring by holding it straighter then factory spring guides. We can use other materials if the customer prefers.
· Titan premium after market main spring.
· Top hat style spring guide (really a piston weight) machined to fit at the front of the main spring, if possible. This helps reduce spring torque reaction that causes the gun to rotate when fired.
· Polish the muzzles crown to ensure a smooth even crown and touch up the bluing of the crown.
Custom Tune Plus price is $140.00
