Stock Gun Players Association Rules

SPGA original rules for Stock Class Paintball

• A stock gun is powered by a single 12 gram powerlet. It is a pump gun. The paintballs are gravity fed from a tube that is parallel to the barrel.
• The barrel may be any length but must be smoothbore and solid. This means- no holes, rifling, or muzzle brakes. There can be one barrel addition but it may not exceed eight inches from the tip of the (original gun’s) barrel and may not be drilled, rifled, etc.
• The feed tube can not hold more than 20 paintballs either capped or with a tube inserted. It must be flat and can have no ramps to encourage balls to roll to the bolt. There can be no arrangement to impede the balls from rolling off the bolt except the thickness of the main body and the tube above it. There can only be one ball in the same plane as the entrance to the bolt. This means an arrangement where the ball drops to the side then into the bolt is not allowed.
• No quick changes for the CO2. This means the knob holding the CO2 in must be unscrewed and the cartridge dropped out through the threads. For safety reasons, the knob must be turned at least one and one half full revolutions to remove it. No check valves. Removing the CO2 must inactivate the gun.
• No auto triggers.
• Any type of stocks, grips, and sights are allowed.

ORIGINAL FORMAT STOCK CLASS

Feed/Operating System

1. A stock class gun must be manually operated. Some manually actuated mechanical manipulation must be performed to load a ball and cock the stock class gun action. No semi-automatics or double- actions (with the exception of the Crosman 3357 Spot marker).
2. A stock class gun can only be powered by a SINGLE 12 gram cartridge.
3. The paintballs are gravity fed from a tube that is parallel to the barrel. The outer circumference of the tube, or stock feed block, must touch the outer circumference of the barrel.
4. The feed tube can not hold more than 20 paintballs either capped or with a tube inserted.
5. The magazine tube or feeding block’s outer circumference must touch the outer circumference of the barrel. It must be parallel to the longitudinal axis of the barrel. It must be flat and can have no ramps to encourage balls to roll to the bolt. (This is to prevent any design that provides enough space to stack another paintball so that will be ready to load without tilting the stock class gun.)
6. In the feed tube there can be no arrangement to impede the balls from rolling off the bolt except the thickness of the main body and the tube above it.
7. No direct feeds, the stock class gun must be tilted to load EVERY paintball.

Power System

1. No quick changes for the CO2. This means the knob holding the CO2 in must be unscrewed and the cartridge dropped out through the threads. If the grip panels must be removed to change 12 grams, they are exempt.)
2. For safety reasons, the knob must be turned at least one and one half full revolutions to remove it. No check valves. Removing the CO2 must inactivate the ‘marker.
3. Rat-a-tac, Phantom stock class, and other “bucket-type” quick changers are permitted.

Barrel

1. The barrel may be any length but must be smooth bore and solid. This means- no holes, rifling, or muzzle brakes.
2. There can be one barrel addition but it may not exceed eight inches from the tip of the (original marker’s) barrel and may not be drilled, rifled, etc.

Other Equipment

1. No auto triggers.
2. Any type of stocks, grips, and sights are allowed. With the exception of the Battle grips for the Nelspot, that have a drop out hole for the twelve gram.

MODIFIED STOCK CLASS

Feed/Operating System

1. A stock class gun must be manually operated. Some manually actuated mechanical manipulation must be performed to load a ball and cock the paintball guns action. No semi-automatics or double- actions (with the exception of the Crosman 3357 Spotmarker).
2. A stock class gun can only be powered by a single 12 gram cartridge.
3. The paintballs are gravity fed from a tube that is parallel to the barrel. The outer circumference of the tube, or stock feed block, Does not have to touch the outer circumference of the barrel. (This allows players with direct feed pumps attack a stock feed to their marker.)
4. The feed tube can not hold more than 20 paintballs either capped or with a tube inserted.
5. The magazine tube or feeding block’s outer circumference does not have to touch the outer circumference of the barrel. It must be parallel to the longitudinal axis of the barrel. It does not have to be flat. It can have a ramp to encourage balls to roll to the bolt.
6. Direct feeds are allowed as long as no more than two balls are stacked in the direct feed over the bolt.

Power System

1. No quick changes for the CO2. This means the knob holding the CO2 in must be unscrewed and the cartridge dropped out through the threads. (With the exception of: Nelspot 007 & Crosman 3357 Spotmarker. Because the grip panels must be removed to change 12 grams, they have been made exceptions.) However, Battlegrips for the Nelspot (that have a drop out hole for the twelve gram) are not permitted.
2. For safety reasons, the knob must be turned at least one and one half full revolutions to remove it. No check valves. Removing the CO2 must inactivate the ‘marker.
3. Rat-a-tac, Phantom stock class, and other “bucket-type” quick changers are permitted.

Barrel

1. The barrel may be any length and can have any type of venting, holes, rifling, or muzzle brakes.
2. There can be one barrel addition and it can be configured in any way, as in the rules above.

Other Equipment

1. No autotriggers.
2. Any type of stocks, grips, and sights are allowed, This includes Battlegrips for the Nelspot, that have a drop out hole for the twelve gram.

EXTREME STOCK CLASS

1. This is like MODIFIED STOCK CLASS, but any air system can be used. Players are not restricted to 12 grams.
2. Pneumatic assist mechanisms and any other modification that does not break the Modified Stock Class Rules can be used.

OPEN STOCK CLASS

All the above classes are included. The only restriction is in velocity.

1. Markers conforming to Original Format Stock Class Rules: 290 fps
2. Markers conforming to Modified Stock Class Rules: 280 fps
3. Markers conforming to Extreme Format Stock Class Rules: 270 fps

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