330 FPS Velocity Upgrade
Designed for balancing BB velocity & Rate of Fire. The "1 joule upgrade" is perfect for close to medium ranges. This type of upgrade is not intended for range, but for a subtle increase of BB velocity to get to your targets faster when within range. Good for the player that enjoys getting closer to their opposition.

360 FPS Velocity Upgrade
Designed for high BB velocity with low resistant. This upgrade is great for agressive medium and long range skirmishes. We recommend using a battery with a 20~30 AMP output rate (See batteries in our catalog page)
This upgrade is not recommended for Close Quarters (indoor ranges or within 30 feet).

400 FPS Velocity Upgrade
Designed for high BB velocity. The 1.5 joule upgrade is great for long range skirmishes. We recommended using a minimum 9.6v 1100 battery to insure optimal performance (8.4v 1700mAh++ works fine). Not recommended for CQB.

400 FPS Hard Recoil Velocity Upgrade
Designed to give your AEG a loud crack with a hard "recoil". This customization is compliments any AEG, especially those with a short inner barrel and large battery. *Stock Marui version 2 mech boxes (MP5, M4, G3 series) are notorious for breaking prematurely with upgraded internals. To prevent cracking, it is highly recommended that a Systema reinforced gearbox is used (ADD $70).

400 FPS DX Velocity Upgrade
Designed for high BB velocity w/the highest quality parts (Prometheus). The 1.5 joule upgrade is great for long range skirmishes. We recommended using a minimum 9.6v 1100 battery to insure optimal performance (8.4v 1700mAh++ works fine). Not recommended for CQB.

400 FPS Reinforced Velocity Upgrade
Designed for durability. Add life and an upgrade to your gun with this plan. Adding a heavier spring to any gun will obviously increase the tension to your internals and add the risk of increased wear, therefore, a reinforced gearbox is included in this upgrade plan.

300-330 FPS Economic High Speed Upgrade
Designed for a high rate of fire with a slight velocity increase. Most AEGs fire at 800 rounds per minute. With this customization, your AEG's rate of fire will be close to 1,000+ rounds per minute at 300FPS or 328FPS with .20 gram BB's. Great for close to medium range skirmishes.

300-330 FPS High Speed Upgrade
Designed for a high rate of fire with a moderate velocity increase. Most AEGs fire at 600-800 rounds per minute. With this customization, your AEG's rate of fire will be close to 1,200+ rounds per minute. Great for medium range skirmishes.

400 FPS Reinforced High Speed Upgrade
Designed to insure durability with a high fps upgrade. The best of both worlds! This upgrade features reinforced internal parts. Nothing will break in this bad boy.