1. Introduction
This manual provides essential information for the safe and effective use of your GoldenBall 3357 Pro Series CNC Gas Blowback Airsoft Pistol. Please read this manual thoroughly before operating the airsoft pistol to ensure proper handling, maintenance, and safety.
2. Safety Information
WARNING: Airsoft guns are not toys. Misuse may cause serious injury, including eye injury. Always wear eye protection. Always treat an airsoft gun as if it were loaded. Keep fingers off the trigger until ready to fire. Keep out of reach of children.
- Always wear approved eye protection when handling or operating the airsoft pistol.
- Never point the airsoft pistol at anything you do not intend to shoot.
- Ensure the safety mechanism is engaged when the airsoft pistol is not in use.
- Use only 6mm airsoft BBs. Do not use metal BBs or other projectiles.
- Store the airsoft pistol unloaded and in a secure location, separate from BBs and gas.
- Familiarize yourself with local laws and regulations regarding airsoft guns.
3. Package Contents
Verify that all items are present in your package:
- 1x GoldenBall 3357 Pro Series Airsoft Pistol
- 1x 30-Round Magazine
- 1x User Manual (this document)
4. Setup
4.1. Loading the Magazine with BBs
- Hold the magazine firmly.
- Pull down the follower spring tab located at the bottom of the magazine.
- Insert 6mm airsoft BBs into the loading port until the magazine capacity of 30 rounds is reached.
- Gently release the follower spring tab.
4.2. Loading Gas (Green Gas or CO2)
The GoldenBall 3357 Pro Series is compatible with both Green Gas and CO2. Refer to your magazine type for specific instructions.
For Green Gas Magazines:
- Locate the gas fill valve at the bottom of the magazine.
- Hold the green gas canister upside down and align its nozzle with the magazine's fill valve.
- Press firmly for 5-10 seconds until the magazine is sufficiently charged. Avoid overfilling.
For CO2 Magazines:
- Unscrew the bottom plate or cap of the CO2 magazine.
- Insert a 12g CO2 cartridge into the designated slot.
- Tighten the cap or screw until the CO2 cartridge is pierced and sealed. Do not overtighten.
4.3. Initial Inspection
Before first use, inspect the airsoft pistol for any visible damage or loose parts. Ensure the slide moves freely and the safety mechanisms function correctly.

Image 1: Left side view of the GoldenBall 3357 Pro Series Airsoft Pistol, showcasing the CNC aluminum slide and textured grip.
5. Operating Instructions
5.1. Loading the Airsoft Pistol
- Ensure the safety is engaged.
- Insert the loaded and gassed magazine into the magazine well until it clicks securely into place.
- Pull the slide fully to the rear and release it to chamber the first BB. The airsoft pistol is now ready to fire.
5.2. Firing
- Point the airsoft pistol in a safe direction, towards an appropriate target.
- Disengage the safety.
- Place your finger on the trigger and squeeze to fire. The airsoft pistol operates in semi-automatic mode with realistic blowback action.
- After firing, engage the safety mechanism.
5.3. Safety Mechanisms
The 3357 Pro Series features standard pistol safety mechanisms. Always ensure you understand and utilize these features:
- Manual Safety: Typically located on the frame, this lever prevents the trigger from being pulled when engaged.
- Grip Safety: Requires a firm grip on the pistol for the trigger to be actuated.
5.4. Hop-Up Adjustment
The hop-up system applies backspin to the BB, increasing its range and accuracy. The adjustment mechanism is typically located under the slide or within the barrel assembly. Consult a detailed diagram or video specific to the 3357 Pro Series for precise adjustment instructions, as it may require partial disassembly of the slide.

Image 2: Right side view of the GoldenBall 3357 Pro Series Airsoft Pistol, highlighting the controls and ergonomic design.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your airsoft pistol.
6.1. Cleaning
- Barrel Cleaning: Use a cleaning rod with a small piece of cloth and silicone oil to clean the inner barrel. Push the rod through from the breech end to the muzzle.
- Exterior Cleaning: Wipe down the exterior with a clean, dry cloth to remove dirt and debris.
6.2. Lubrication
Apply a small amount of silicone oil to moving parts such as the slide rails, hammer assembly, and O-rings in the magazine. Avoid using petroleum-based lubricants, as they can damage rubber and plastic components.
6.3. Storage
Store the airsoft pistol in a cool, dry place, away from direct sunlight and extreme temperatures. Ensure the magazine is unloaded of BBs and gas before storage. Engage all safety mechanisms.

Image 3: Front-right view of the GoldenBall 3357 Pro Series Airsoft Pistol, showing the muzzle and front sights.
7. Troubleshooting
This section addresses common issues you might encounter.
| Problem | Possible Cause | Solution |
|---|---|---|
| BBs not firing or weak shots | Low gas pressure, empty magazine, dirty barrel, hop-up misadjustment | Refill gas, load BBs, clean barrel, adjust hop-up |
| Gas leaking from magazine | Damaged O-rings, loose fill valve | Apply silicone oil to O-rings, tighten fill valve, replace damaged seals |
| Slide not cycling properly | Insufficient lubrication, low gas, obstruction | Lubricate slide rails, refill gas, check for obstructions |
| BBs jamming in barrel | Incorrect BB size, dirty barrel, damaged BBs | Use correct 6mm BBs, clean barrel, use high-quality BBs |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | GoldenBall |
| Model | 3357 Pro Series |
| Color | Black |
| Magazine Capacity | 30 Rounds |
| Caliber | 6mm Airsoft BBs |
| Item Weight | 950 Grams |
| Power Type | Green Gas / CO2 (magazine dependent) |
| Barrel Material | Metal with CNC aluminum slide and compensator |
| Frame Material | Metal with CNC aluminum slide and compensator |
| Operation | Semi-Automatic, Gas Blowback |
| UPC | 193939140227 |

Image 4: Top-down view of the GoldenBall 3357 Pro Series Airsoft Pistol, showcasing the slide design and sights.
9. Warranty Information
The manufacturer's warranty for this product does not cover damages or malfunctions. Please refer to your retailer's return policy for any initial defects upon purchase.
10. Support
For further assistance or inquiries regarding your GoldenBall 3357 Pro Series Airsoft Pistol, please contact the retailer from whom you purchased the product. They can provide guidance on product-specific issues or direct you to appropriate resources.
You may also visit the GoldenBall Store on Amazon for additional product information.