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Newly Arrived

Tactical Airsoft Grenade Bandolier

$34.99 ADD TO CART

PTS Centurian Arms C4 Rail

$99.99 ADD TO CART

PTS Griffin M4SD-II Muzzle Break CCW

$32.99 ADD TO CART
 

Upgrades Airsoft AEG Gear Box

Full Line of Airsoft Gun AEG Gear Box and Mech Box. These are usually fully assembed, drop in gear boxes. These are great choices for a simple but complete overhaul of the entire gear box.

Wolverine Airsoft SMP HPA System V3

Item Code: AC-UPI-WASMP-V3
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: PolarStar Airsoft & Wolverine Airsoft
Manufacturer Part No: Version 3 Unit
Stock: Yes & Ships w/in 24Hrs*
 
Wolverine Airsoft SMP HPA System V3
Features:
- HPA Drop in Cylinder Replacement
- Compatible with Standard TM Style V3 Gearboxes
- Adjustable Velocity, ROF, and Burst Settings
- Instant Trigger Response Without First Round Dry Fire

Wolverine Airsoft SMP HPA System V3
Price:$389.99  per EACH
QTY:   Add to cart Add to Wish List
 

Wolverine Airsoft SMP HPA System V2

Item Code: AC-UPI-WASMP-V2
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: PolarStar Airsoft & Wolverine Airsoft
Manufacturer Part No: Version 2 Unit
Stock: Yes & Ships w/in 24Hrs*
 
Wolverine Airsoft SMP HPA System V2
Features:
- HPA Drop in Cylinder Replacement
- Compatible with Standard TM Style V2 Gearboxes
- Adjustable Velocity, ROF, and Burst Settings
- Instant Trigger Response Without First Round Dry Fire

Wolverine Airsoft SMP HPA System V2
Price:$389.99  per EACH
QTY:   Add to cart Add to Wish List
 

Systema MP5 Energy Gear Box M150

Item Code: AC-UPI-SMP-150
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Systema Airsoft
Stock: Yes & Ships w/in 24Hrs*
 
Systema Complete Energy Mecha-Box for MP5 Series (A4, A5, SD5, SD6)
- Complete Drop In Gear Box for Full Stock Rear Battery MP5 with M150 Upgrade Spring for 470 - 500 FPS
- All internal parts completed upgraded with Systema Parts (gears, bearings, tappet late, cylinder, bearing spring guide rod, selector plate, low resistance wires)
- Completely Reinforced Heavy Duty Alloy Gear Box
- Includes All Helical Super Torque Up Gear Set with Bore Up Cylinder Set
Systema MP5 Energy Gear Box M150
Price:$259.99  per EACH
QTY:   Add to cart Add to Wish List
 

Systema MP5 Airsoft Gear Mech Box M120

Item Code: AC-UPI-SMP-12X
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Systema Airsoft
Stock: Yes & Ships w/in 24Hrs*
 
Systema Complete Mecha-Box for MP5 Series (A4, A5, SD5, SD6)
- Complete Drop In Gear Box for Full Stock Rear Battery MP5 with M120 Upgrade Spring for 370 - 400 FPS
- All internal parts completed upgraded with Systema Parts (gears, bearings, tappet late, cylinder, bearing spring guide rod, selector plate, low resistance wires)
- Completely Reinforced Heavy Duty Alloy Gear Box
- Includes Torque Up Gear Set with Teflon Cylinder
Systema MP5 Airsoft Gear Mech Box M120
Price:$239.99  per EACH
QTY:   Add to cart Add to Wish List
 

*PolarStar Fire Control Unit FCU Rev. 2

Item Code: AC-UPI-PS-FCU
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: PolarStar Airsoft & Wolverine Airsoft
Manufacturer Part No: PS FCU REV2
Stock: Yes & Ships w/in 24Hrs*
 
*PolarStar Fire Control Unit (FCU) Rev. 2 Gen 2 & Gen 3
- Compatible with both Generation 2 and Generation 3 Fusion Engines
- Control the Rate of Fire or Burst settings from this unit.
*PolarStar Fire Control Unit FCU Rev. 2
Price:$104.99  per EACH
QTY:   Add to cart Add to Wish List
 

MODIFY M4-A1 Hi-Torque Complete Gear Box

Item Code: AC-UPI-MOD-814
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Modify Airsoft & Speed Triggers
Manufacturer Part No: MOD MB M4 TQ (CGB-814)
Stock: Yes & Ships w/in 24Hrs*
 
MODIFY M4-A1 Hi-Torque Complete V2 Gearbox
Include:
- M120 Spring
- Rotary Spring Guide
- Tappet Plate
- Modular Gear Set (21.6)
- Seletor Plate
- PolyCarb Piston
- PolyCarb Piston Head w/ Bearing
MODIFY M4-A1 Hi-Torque Complete Gear Box
Price:$209.99  per EACH
QTY:   Add to cart Add to Wish List
 

MODIFY M4-A1 Hi-Speed Complete Gear Box

Item Code: AC-UPI-MOD-804
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Modify Airsoft & Speed Triggers
Manufacturer Part No: MOD MB M4 S (CGB-804)
Stock: Yes & Ships w/in 24Hrs*
 
MODIFY M4-A1 Hi-Speed Complete V2 Gearbox
Include:
- M100 Spring
- Rotary Spring Guide
- Tappet Plate
- Modular Gear Set (16.32.1)
- Seletor Plate
- PolyCarb Piston
- PolyCarb Piston Head w/ Bearing
MODIFY M4-A1 Hi-Speed Complete Gear Box
Price:$219.99  per EACH
QTY:   Add to cart Add to Wish List
 

ICS Upgraded MP5 Ver 2 Gear Box Electric

Item Code: AC-UPI-MC-53
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: ICS (I Chih Shivan)
Stock: Yes & Ships w/in 24Hrs*
 
Compatible w/ ICS or Tokyo Marui MP5, G3, M16, M4
Upgraded Gear Box Set includes: Reinforced Gear Box, M120 Spring, Metal Bushings, Metal Bering Spring Guide Rod, Aluminium Piston, & Gear Set
- New 2008 Version: Now Even More Re-inforced
ICS Upgraded MP5 Ver 2 Gear Box Electric
Price:$74.99  per EACH
QTY:   Add to cart Add to Wish List
 

ICS M4 Upgraded Upper Gearbox MA-56

Item Code: AC-UPI-MA120K
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: ICS (I Chih Shivan)
Stock: Yes & Ships w/in 24Hrs*
 
ICS M4 Upgraded Upper Gear Box with M120 Spring
Includes: Upper Gear Box, M120 Spring, Metal Bearing Spring Guide Rod, Tappet Plate, Piston, Piston Head, Ported Cylinder, Cylinder Head, and Feed Nozzle.
Compatible with ICS M4 or M16
Upgrades FPS to 400
ICS M4 Upgraded Upper Gearbox MA-56
Price:$59.99  per EACH
QTY:   Add to cart Add to Wish List
 

ICS Full Metal Airsoft AEG Gearbox V2

Item Code: AC-UPI-ICS-MC63
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: ICS (I Chih Shivan)
Manufacturer Part No: MC-63
Stock: Yes & Ships w/in 24Hrs*
 
ICS Full Metal Airsoft AEG Gearbox Shell V2
- ICS Full Metal Reinforced Gearbox Shell
- Compatible w/ most Airsoft AEG Rifles that use Version 2 Gearbox
- Perfect Upgrade for those AEG w/ weak or plastic Gearboxes
- DOES NOT Include ANY internal parts. Shell ONLY
- Some Modification May Be Required
ICS Full Metal Airsoft AEG Gearbox V2
Price:$29.99  per EACH
QTY:   Add to cart Add to Wish List
 

ICS MP5 Ver 2 Complete AEG GearBox

Item Code: AC-UPI-ICS-MC62
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: ICS (I Chih Shivan)
Stock: Yes & Ships w/in 24Hrs*
 
ICS MP5 AEG Gear Box Fully Assembled
- ICS & Tokyo Marui MP5 Compatible
Complete Airsoft GearBox Set includes: Reinforced Gear Box, M100 Spring, Metal Bushings, Metal Bering Spring Guide Rod, Aluminium Piston, & Gear Set
- Perfect option for fixing AEG airsoft gear box
ICS MP5 Ver 2 Complete AEG GearBox
Price:$99.99  per EACH
QTY:   Add to cart Add to Wish List
 

G&P M120 High Speed Short AEG Motor

Item Code: AC-UPI-GP-M120S
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Guarder G&P & Element
Manufacturer Part No: GP690
Stock: Yes & Ships w/in 24Hrs*
 
G&P M120 High Speed Short AEG Motor
Features:
- 35500 RPM High Speed Motor
- Drop In Replacement for AKs, UMPs, and More
- Suitable for Up To A M120 Spring
G&P M120 High Speed Short AEG Motor
Price:$34.99  per EACH
QTY:   Add to cart Add to Wish List
 

G&P M120 High Speed Long AEG Motor

Item Code: AC-UPI-GP-M120L
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Guarder G&P & Element
Manufacturer Part No: GP561
Stock: Ships in 8 Weeks
 
G&P M120 High Speed Long AEG Motor
Features:
- 35500 RPM High Speed Motor
- Drop In Replacement for M4s, M16s, and More
- Suitable for Up To A M120 Spring
G&P M120 High Speed Long AEG Motor
Price:$34.99  per EACH
QTY:   Add to cart Add to Wish List
 

G&P M120 High Speed DMR AEG Motor

Item Code: AC-UPI-GP-M120D
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Guarder G&P & Element
Manufacturer Part No: GP837
Stock: Yes & Ships w/in 24Hrs*
 
G&P M120 High Speed DMR AEG Motor
Features:
- 35500 RPM High Speed Motor
- Drop In Replacement for the G&P M14 DMR
- Suitable for Up To A M120 Spring
G&P M120 High Speed DMR AEG Motor
Price:$34.99  per EACH
QTY:   Add to cart Add to Wish List
 

GHK V2 AEG to GBB Gearbox Conversion Kit

Item Code: AC-UPI-GHK-GBOX
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: GHK Airsoft
Manufacturer Part No: GBB BOX
Stock: Ships in 4 Weeks
 
GHK V2 AEG Gearbox Conversion Kit
The GHK Gearbox Conversion Kit gives you the ability to convert your M4 AEG from a Version 2 Gearbox to a Gas Blowback Rifle.
Kit Includes:
- GHK Gas Blowback Gearbox
- Hop Up Unit
- Buffer Tube Locking Unit
- 38 Round Gas M4 Magazine
GHK V2 AEG to GBB Gearbox Conversion Kit
Price:$99.99  per EACH
QTY:   Add to cart Add to Wish List
 

PolarStar Airsoft V3 AK Fusion Engine

Item Code: AC-UPI-FEV3-AK
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: PolarStar Airsoft & Wolverine Airsoft
Manufacturer Part No: FEV3-AK
Stock: Yes & Ships w/in 24Hrs*
 
PolarStar AK Airsoft AEG Fusion Engine Kit V3
- Fire mode/s: Full Auto, Semi Auto, Variable Burst
- FE Profile: Version 3
- FE Nozzle Type: AK Series, Blue (FE-NZ-BLU-AK)
- Selector Plate: AK Series
- Cyclic Rate: 500 RPM to 1,800 RPM
- Fire Modes: Semi / 2 to 9 Shot Burst, Semi / Full Auto, Semi Only
PolarStar Airsoft V3 AK Fusion Engine
Price:$500.00  per EACH
QTY:   Add to cart Add to Wish List
 

PolarStar Airsoft M4/16 Fusion Engine V2

Item Code: AC-UPI-FEV2-M4
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: PolarStar Airsoft & Wolverine Airsoft
Manufacturer Part No: FEV2-M4
Stock: Ships in 1 Week
 
PolarStar M4 M16 Airsoft AEG Fusion Engine Kit V2 GEN. 3
- Designed, manufactured and built in the U.S.A.
- Assembled from CNC machined aluminum components
- User selectable Semi/Full Auto, Semi Auto Only and Variable Burst modes
- Open Bolt and Closed Bolt firing modes
- Independently adjustable velocity and cyclic rate
- Interchangeable air nozzles to shift the velocity adjustment range up or down
PolarStar Airsoft M4/16 Fusion Engine V2
Price:$500.00  per EACH
QTY:   Add to cart Add to Wish List
 

*PolarStar Airsoft M249 Fusion Engine

Item Code: AC-UPI-FE-M249
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: PolarStar Airsoft & Wolverine Airsoft
Manufacturer Part No: FEM249
Stock: Ships in 1 Week
 
PolarStar M249 Airsoft AEG Fusion Engine Kit
- FE Profile: M249 Series
- FE Nozzle Type: AK Series, Blue (FE-NZ-BLU-AK)
- Selector Plate: N/A
- Cyclic Rate: 500 RPM to 1,800 RPM
- Fire Modes: Semi / 2 to 9 Shot Burst, Semi / Full Auto, Semi Only
*PolarStar Airsoft M249 Fusion Engine
Price:$500.00  per EACH
QTY:   Add to cart Add to Wish List
 

Deep Fire AEG Reinforced 7mm Gearbox II

Item Code: AC-UPI-DF-CPO25
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Deep Fire Upgrade Parts
Stock: Yes & Ships w/in 24Hrs*
 
Deep Fire Reinforced 7mm Mech Box Ver. 2
Built with solid metal composite to withstand higher spring tensions and outlast any standard gearbox. Perfect for upgraded gear boxes with higher spring tensions or for gear box replacements. ...
Deep Fire AEG Reinforced 7mm Gearbox II
Price:$39.99  per EACH
QTY:   Add to cart Add to Wish List
 

Deep Fire 6mm Bearing Reinforced Gearbox

Item Code: AC-UPI-DF-CPO22
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Deep Fire Upgrade Parts
Stock: Yes & Ships w/in 24Hrs*
 
Deep Fire Reinforced 6mm Mech Box Shell Ver 2 with Bearing Bushings
Built with solid metal composite to withstand higher spring tensions and outlast any standard gearbox. Perfect for upgraded gear boxes with higher spring tensions or for gear box replacements.
Deep Fire 6mm Bearing Reinforced Gearbox
Price:$34.99  per EACH
QTY:   Add to cart Add to Wish List
 

Deep Fire AEG Reinforced 6mm Gearbox II

Item Code: AC-UPI-DF-CPO21
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Deep Fire Upgrade Parts
Stock: Yes & Ships w/in 24Hrs*
 
Deep Fire Reinforced 6mm Mech Box Shell Ver 2
Built with solid metal composite to withstand higher spring tensions and outlast any standard gearbox. Perfect for upgraded gear boxes with higher spring tensions or for gear box replacements.
Deep Fire AEG Reinforced 6mm Gearbox II
Price:$29.99  per EACH
QTY:   Add to cart Add to Wish List
 

Boyi Dboys M4 7mm Ver. 2 Upgrade Gearbox

Item Code: AC-UPI-BI-15-GB
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Boyi Dboys
Stock: Ships in 8 Weeks
 
Boyi Dboys M4 7mm Version 2 Upgrade Gearbox
- Complete with all upgraded Internals, such as 7mm bushings, M120 spring, reinforced set of metal gears, and premium grease lubrication. This gearbox is high performance and requires professional installation for optimum performance.
Boyi Dboys M4 7mm Ver. 2 Upgrade Gearbox
Price:$59.99  per EACH
QTY:   Add to cart Add to Wish List
 

APS ASR AEG M4 Airsoft Full Gear Box V2

Item Code: AC-UPI-APS-V2
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: APS Airsoft
Manufacturer Part No: APS-2HF
Stock: Yes & Ships w/in 24Hrs*
 
APS ASR AEG M4 Completed V2 Gear Box
Specifications:
- Full Gear Box at an Unbeatable Price! - Compatitible with most of the AEG guns in the world
- Made of Metal
- Completed Gear Box without Motor
- Electric Blow Back Gear Box
- Wire set included
APS ASR AEG M4 Airsoft Full  Gear Box V2
Price:$54.99  per EACH
QTY:   Add to cart Add to Wish List
 

Deep Fire M16 G3 MP5 Switch Set

Item Code: AC-UPE-DF-CP062
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Deep Fire Upgrade Parts
Manufacturer Part No: DF-CP062
Stock: Yes & Ships w/in 24Hrs*
 
DeepFire M16 G3 MP5 Switch Set
This is the internal Selector Switch Set for the M16, G3, or MP5 Gearbox. This set features DEANS connection out of the box and can resist up to 350 Degrees C. An important upgrade part for players who love using lipo batteries and semi auto games.
Deep Fire M16 G3 MP5 Switch Set
Price:$11.99  per EACH
QTY:   Add to cart Add to Wish List
 

Deep Fire M4 Switch Set V2 Wiring Set

Item Code: AC-UPE-DF-CP061
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Deep Fire Upgrade Parts
Manufacturer Part No: DF-CP061
Stock: Yes & Ships w/in 24Hrs*
 
Deep Fire M4 Switch Set V2 Wiring Set
This is the internal Selector Switch Set for the Version 2 M4 Gearbox. This set features DEANS connection out of the box and can resist up to 350 Degrees C. An important upgrade part for players who love using lipo batteries and semi auto games.
Deep Fire M4 Switch Set V2 Wiring Set
Price:$11.99  per EACH
QTY:   Add to cart Add to Wish List
 

Deep Fire Version 3 G36 Switch Set

Item Code: AC-UPE-DF-CP060
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Deep Fire Upgrade Parts
Manufacturer Part No: DF-CP060
Stock: Yes & Ships w/in 24Hrs*
 
DeepFire V.3 G36 Switch Set
This is the internal Selector Switch Set for the Version 3 G36 Gearbox. This set features DEANS connection out of the box and can resist up to 350 Degrees C. An important upgrade part for players who love using lipo batteries and semi auto games.
Deep Fire Version 3 G36 Switch Set
Price:$11.99  per EACH
QTY:   Add to cart Add to Wish List
 

Deep Fire Version 3 Gearbox Switch Set

Item Code: AC-UPE-DF-CP059
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Deep Fire Upgrade Parts
Manufacturer Part No: DF-CP059
Stock: Yes & Ships w/in 24Hrs*
 
Deep Fire Version 3 Gearbox Switch Set
This is the internal Selector Switch Set for the Version 3 Gearbox. This set features DEANS connection out of the box and can resist up to 350 Degrees C. An important upgrade part for players who love using lipo batteries and semi auto games.
Deep Fire Version 3 Gearbox Switch Set
Price:$11.99  per EACH
QTY:   Add to cart Add to Wish List
 

*Build-A-Rig Super Low Pressure Air Rig

Item Code: AC-PS-V899001
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: Valken Tactical
Manufacturer Part No: V899001
Stock: Yes & Ships w/in 24Hrs*
 
*Build-A-Rig AA Super Low Pressure Air Rig
This air rig is a SLP (Super Low Pressure) Air Rig. This system incorporates a robust single regulator that allows you to adjust your PSI with the ease of twisting a knob or you can lock it out with slight modification to the regulator knob.

Please note, this air rig can NOT use any HPA tank that outputs higher than 300 PSI! SLP tanks are required!

*Build-A-Rig Super Low Pressure Air Rig
Price:$84.99  per EACH
QTY:   Add to cart Add to Wish List
 

Redline Firebase PolarStar HPA Air Rig

Item Code: AC-PS-RIG-RLFB
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: PolarStar Airsoft & Wolverine Airsoft
Manufacturer Part No: RIG-RLFB
Stock: Ships in 1 Week
 
Redline Firebase PolarStar HPA Air Rig
-For Use With The Polar Star Fusion Engine Series

CO2 and Propane cannot be used to power the Fusion Engine. Using liquid propellants such as this can result in damage to the system
Redline Firebase PolarStar HPA Air Rig
Price:$175.00  per EACH
QTY:   Add to cart Add to Wish List
 

Polar Star Fusion Engine Macro Line 1 FT

Item Code: AC-HPA-PS-MACRO
Airsoft Gun Style: Upgrades Airsoft AEG Gear Box
Manufacturer: PolarStar Airsoft & Wolverine Airsoft
Manufacturer Part No: Black Macro Line
Stock: Ships in 1 Week
 
Polar Star Fusion Engine Macro Line 1 FT
High quality Macro line hose for running an air connection from an ASA to a regulator.
Polar Star Fusion Engine Macro Line 1 FT
Price:$4.99  per EACH
QTY:   Add to cart Add to Wish List
 
 

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