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<Sterling STP>

Considered the ‘Rolls Royce’ of pump guns, the STP is now manufactured on state-of-the-art CNC machines. Updated and improved with build quality in mind, the Sterling cannot be touched for finish, reliability or performance. With years of tournament use behind it, this is truly one of the enduring design classics favoured by pump aficionados worldwide.

The STP comes bottom lined as standard, 10” precision honed aluminium Spyder Thread Barrel. Polished internals for the smoothest possible action. Supplied with milled aluminium 45 frame, Hogue wrap around grip and trigger shoe for the ultimate in comfort. Finished in a choice of hard-wearing anodised colours: Black, Grey, Silver, Red, Green,
Blue and Purple.

14 May, 1999 This marker has been factory set to be used on Air (or Nitrogen, USA) If you are using regulated air, set the output pressure of the regulator for 450 /500 psi.If you are using CO2 then please observe the following: -VAPOUR ONLY: -Due to the nature of CO2 it is very difficult to achieve vapour throughout extreme temperature conditions.

So if you choose vapour CO2 as your power source, then here are some possible combinations.

1. REGULATED. You will need a reliable regulator that allows CO2 vapour use. In addition you will need a bottle that has an anti-siphon tube fitted, this will help prevent liquid CO2 from being drawn 
into the regulator.

2. EXPANSION TANK. This would normally be used on a vapour set up in place of the regulator. However due to the nature of a pump this may be difficult to fit. Again an anti siphon tube will need to be fitted 
to the bottle.

3. REMOTE SET UP. This configuration will allow gas vapour to be drawn from the top of the bottle. Used in conjunction with a remote expansion system should ensure that no liquid will be drawn into the gun. Note, NO anti siphon tube is required on the bottles.


<Sterling manual>

PUMPG0015 - Black
PUMPG0015B - Blue
PUMPG0015G - Green
PUMPG0015GR - Grey
PUMPG0015P - Purple
PUMPG0015S - Silver
PUMPG0015SB - Steel Blue


be to the bottles used with this set up.

Velocity Adjustment:-
Velocity adjustments determined by the differential spring tension on relevant hammer and exhaust valve.
To simplify, the spring tension behind the hammer striking the exhaust valve and opening the valve, allows a gas burst to blow the ball out through the barrel. So, more spring tension behind the hammer will give bigger burst and therefore higher velocity. By changing this spring with one of less tension it will lower the velocity.

In the past days of the sterling, it was quite a common practice to "clip" a coil off of the spring to shorten it, thus creating less tension. Also, shim washers were used and placed in the hammer to "pack out" the spring creating more tension. The idea being to use a spring which allowed a range of adjustment, simply by adding or removing washers. A selection of springs will be available shortly in a spring kit from Arrow Precision.


base bar