To Charge the Sumatra Rifle:

NOTE: USE COMPRESSED AIR ONLY. Other gases are dangerous and will void the warranty. Under no condition should this rifle be filled over 3,000 PSI. This is dangerous and will void the warranty. The quick-fill dust cap is located at the end of the lower air reservoir tube below the barrel. DO NOT REMOVE IT! Simply rotate the cap in either direction until the female receptor port is exposed. After you finish re-filling the rifle, rotate the dust Gap to close off the receptor port. Any dirt here can cause the rifle’ s valves to fail.

To Charge the Sumatra Rifle with the Hand Pump:

The Easy up 10 Hand Pump is the most convenient method to charge your rifle. This sturdy pump is light to carry. It comes with a convenient carrying bag to accompany the rifle in the field or wherever you use it.
To ensure safe operation, you should refill the rifle without the distraction of others nearby, especially children or animals.
Be sure the rifle is unloaded.
Lay the rifle pointed in a safe direction next to the pump. The pump’s adapter probe should be within easy reach of the rifle’s adapter port.
Hand tighten the bleeder valve on the base of the pump.
Carefully insert the adapter probe from the pump hose into the rifle’s exposed receptor port, taking care not to snag the double “O” ring on the edges of the dust cap.
Use silicone grease (sold in scuba diving stores) to dress the “O” rings before each fill.
Caution: Do not use other products that may have a low flash point. It is extremely dangerous to use such products in this high-pressure area. This can lead to an explosion.
Pump the rifle twelve times. This should prime the hose enough to allow you to take an initial reading of the rifle s current pressure level. If you hear air leaking, carefully check all connections. If you cannot resolve the air leaks, return the pump immediately to your dealer for inspection.
Begin pumping in 20 stroke sets, taking a reading each time of the pressure level and allowing at least a 2 minute cooling period in-between each set, especially when the pressure reaches 2500 p.s.i. (175 k g/CM2). Do not exceed 3,000 p.s.i.
The best technique to operate the pump is to use your upper body weight to push down on the pump, keeping your arms rigid. This method is less fatiguing than using only your arm strength to operate the pump.
Once the rifle has reached the desired pressure, open the bleeder valve on the bass of the pump. You will hear a loud rush of air escape from the small hole in the bass of the pump. You can now safely remove the pump’s probe adapter from the rifle’s receptor port.

To Charge the Sumatra Rifle from a Scuba Tank:

To ensure safe operation, you should refill the rifle without the distraction of others nearby, especially children or animals.
Be sure the rifle is unloaded.
Lay the rifle pointed in a safe direction next to the scuba tank. The adapter probe from the scuba tank should be within easy reach of the rifle's adapter port.
Connect the adapter hose to the scuba tank (standard 3,000 p.s.i.)
Hand tighten the bleeder valve on hose.
Carefully insert the adapter probe from the other end of the hose into the rifle’s exposed receptor port, taking care not to snag the double “O” ring on the edges of the dust cap.
Use silicone grease (sold in scuba diving stores) to dress the “O” rings before each fill. Caution: Do not use other products that may have a low flash point. It is extremely dangerous to use such products in this high pressure area. This can lead to an explosion.
Open the main valve to allow a slow, controlled infusion of air. If you hear air leaking, carefully check all connections. If you cannot resolve the air leaks, return the hose adapter unit to your dealer for inspection.
Once the desired air pressure is reached, CLOSE THE MAIN VALVE on the scuba tank. Do not exceed 3,000 p.s.i.
OPEN THE BLEED VALVE. You will hear a loud rush of air escape from the bleeder valve.
You can now safely remove the hose’s probe adapter from the rifle’s receptor port. Built-in Pressure Gauge:
The rifle’s pressure gauge is located at the end of the lower air reservoir tube.
The pressure gauge gives an approximate reading and can differ on each rifle. For example, charged with 2500 p.s.i. one built-in pressure gauge might show 19, while another rifle’s pressure gauge might show 21 with the same 2,500 p.s.i. Charge.
Use the gauge as a convenient method to quickly check your power level for accurate shooting.
a) For example, note the pressure level on the gauge after you have fully charged the rifle (i.e. 3,000 p.s.i.).
b) Then check the gauge again when you first notice a change in the impact point due to the pressure dropping from firing a long series of shots.
c) This will allow you to anticipate from checking the level on the gauge when your point of impact will change due to the air pressure decreasing in the rifle.
d) Before long you will be able to interpret the rifle’s gauge and judge how many shots are left before the rifle needs to be refilled.