INTRODUCTION

• Tools you're going to need

• Proper handling of the screws

• The proper ways of taking things apart and putting them back together

THE CYCLING MECHANISM

• Key internal components

• Cycling mechanism explained

YOUR UPGRADE OBJECTIVE

• Marginal performance gain

• FPS and Joule

• Calculating Joule

• Performance measurement

• The performance hierarchy

• General recommendation

HIGH FPS UPGRADE

• The anatomy of compression springs

• Variable-pitch spring

• Grounded spring

• Custom made spring or off-the-shelf spring?

• Reinforcing the internals

• Installing an upgrade spring - the considerations

• The careful use of spacers

IMPROVING ACCURACY AND RANGE

• Short barrel accuracy

• High precision barrel

• Range improvement

• Creating your own hopup unit

• Improving the hopup effect

• V-HopUp

TROUBLESHOOTING AND OTHER TOPICS