Key Advantages
With a suppressor on your rifle you are getting a number of advantages. The most obvious is of course that the noise is reduced.

Other advantages are that both recoil and muzzle-flash are heavily reduced which gives more comfortable shot with a reduced barrel-rise and preserved night vision when shooting in poor light conditions – perfect for hunting wild predators at night for example.

Another advantage with a suppressor is that the rifle gets a weight on the barrel which creates a better stability when shooting on still targets and, which most shooters experience, a more controlled “swing” when shooting on moving targets.
Main designs of suppressors
Muzzle mounted / Front barrel - where the whole suppressor apart from the thread is added to the barrel length.

Over barrel/Reflex - slides over the barrel and has a portion of the expansion chamber behind the barrel opening.

In general, a muzzle mounted suppressor is more efficient in relation to its size compared to an over barrel version, but it can be perceived as it makes the rifle a bit long and “front heavy”. The advantage with the over barrel version is that it is normally perceived as non-obtrusive on the rifle as it normally adds a shorter length to the barrel than the muzzle mounted version.
Suppressor features
Noise reduction
A suppressor reduces the gas pressure by expanding the burning powder gas into one or more chambers inside. The bullet acts as a moving valve that sequentially releases the pressure as the bullet passes the chambers. When the bullet leaves the suppressor, the following gas will flow out of the suppressor at a reduced speed and over a longer time which results in a reduced sound pressure.

A good example of the difference between shooting with and without a suppressor is the difference in noise when opening a champagne bottle by either “shooting” the cork or holding it and slowly releasing the pressure.
Muzzle flash
Depending on calibre and barrel length the combustion is done fully or partially inside the bore of the barrel. Most of the time there is powder burning outside the barrel and creates big muzzle flash.

With a suppressor the powder will be burnt and extinguished inside the suppressor which heavily reduce or eliminates the muzzle flash.
The forward moving gases are being stalled inside the suppressor which reduces the recoil.

There are also opposite directed forces that limit how much the recoil can be reduced such as the weight of the bullet acceleration forward creating the “kick” in the opposite direction. A rule of thumb is that the recoil is reduced with 25-40% when shooting with a suppressor.
A well-manufactured and symmetrical suppressor, fitted correctly on a normal barrel creates better grouping.The weight of the silencer reduces the barrel vibrations which increases the accuracy. 

However with most brands of suppressors the point of impact is slightly lowered. This is not the case with HQS suppressors since we have taken this in consecration in our design.
Bullet speed
The pressure in the suppressor is high and push the bullet forward through the suppressor.

The only resistance the bullet meets inside the suppressor is air or gases from the previous shot. The pushing gas will therefore accelerate the bullet to an higher speed than without a suppressor.
For how long I can use one suppressor?
Every suppressor has a limited life expectancy, similar to a barrel of a gun.

The length of this life depends on the gun caliber, the ammunition you are using, the usage, and the maintenance. If the suppressor is cleaned often and it is not overheated the life is extended substantially and will allow you to reach couple of thousands shots.
All suppressors should be used only with suitable non-modified weapons!

• During usage the suppressor is heating. There is a danger of burning if neoprene protector is not used
• You should not overheat the suppressor
• Burning powder leaves residues, among those water that reacts and creates ammonium. Therefore – always remove the suppressor after being in the field and keep it warm and dry so any humidity dries out
• Cleaning the suppressor after usage prolong its life
• Do not use sharp or abrasive tools to clean the suppressor 
• Use only approved cleaning solvent and grease while cleaning the suppressor. The remaining gasses can lead to explosion if wrong solvent is used

Before use make sure:

• The suppressor matches the caliber of the weapon and the barrel thread
• The suppressor is fully assembled with the tube fully tightened 
• Please shake the suppressor to make sure there are no loose items inside
• For HQS Special, Special Slim, and Special Impact visually check if the midsection openings are open and not covered by the neoprene protector
• The suppressor is fully mounted on the weapon barrel and it is not loose. Please, repeat this step during shooting as well
Download detailed operating instruction from this link