Their are several ways to increase the power of and Air Rifle. But you will need the right tools. Polishing the air chamber will help. Remove any burrs in the slide action will help. using lighter pellets will increase the speed but not the power. Never use regular oil on an ait gun only use pellgun oil. Regular oil will eventually ruin the seals. A bigger spring will help, but make sure you rifle can handle the modification. Their are several airgun shops on the web that can modify or tune up an airgun. Check under "Airgun repair" or "Airgunsmith" on the web and you will find several.
Please state the model you are inquiring about. Is this a C02 or a PCP (Precharged Pneumatic) air rifle?
Add a few drops of Crosman Pellgun oil to your pellets.
No
Don't put as much air in the rifle. If you have a dial to set the power then use it. As you shot the power drops. You can dry fire some PCP air rifles.
It all depends on who made the air rifle and the power plant that the rifle uses.
Only in size and power
It depends on the power of the air rifle, Local laws and the location where you live.
It all depends on the rifle, pellet and power source.
which model I, II or III
The FX Verminator has a 3 step power adjustment on the left side of the barrel. remember the heaver the pellet the slower it will fly but the straighter it will fly and it will have more knock down power over lighter pellets
Well Yes and No. Let me explain. In the USA there is no limit on The power of an air rifle so a strong spring is used. In other countries, like Canada, there is a limit on the power an air rifle, so a different spring is used that produces less power. Normally you do not want to tamper with the design of an air rifle because it could cause damage to other parts of the rifle that may not be able to handle the change in design.
You S510-SL is designed for a particular pressure setting from the factory and can or should not be changed. The owners manual stated how to fill the rifle. DO not attempt to over fill it. It can damage the rifle. See you owners manual or download a new one from (see the link below)