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Airsoft Gun Internal Upgrade Parts

Gearbox, Hop Up Units, Inner Barrels, ETC!

Airsoft GI has worked with enough airsoft guns to know that what’s inside really counts. If your airsoft gun has a broken mechanism or has simply fallen behind the times, our internal upgrade parts will have you back in the game. We have airsoft gun internal parts for AEGs, spring sniper rifles and gas blowback pistols and rifles. Add aftermarket AEG cylinder heads to maximize compression or install a precision inner barrel for better accuracy. Replace a burned-out stock motor with a standard OEM motor or upgrade to a high torque model that can handle other internal upgrades.

Our gas airsoft internal upgrades include recoil springs that increase felt recoil, loading nozzles that improve durability and high flow valves to increase FPS velocity. You can upgrade your spring rifle as well with parts that give your shots more distance and more precision. We carry parts from all the leading airsoft parts manufacturers such as Action Army, Danger Werx, G&G, Modify, SHS, and Lonex – and we make some of our own internal airsoft parts. Full tech support comes with every purchase, so you can turn to us if you encounter troubles while you work.


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Automatic Free Shipping On All Orders Over $179! Coupon code "2024" for 10% off!
Polarstar UGS Type 1 HPA (RS Spec)
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Polarstar UGS Type 1 HPA (RS Spec)

$240.00

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Wolverine Heretic Labs Speed Trigger (Black)

Wolverine Heretic Labs Speed Trigger (Black)

$37.00$33.30

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Wolverine Reaper Gen 2 V2 with Spartan Electronics
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Wolverine Reaper Gen 2 V2 with Spartan Electronics

$345.00

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Wolverine Airsoft 18" Wire Harness (Gen. 2)

Wolverine Airsoft 18" Wire Harness (Gen. 2)

$27.00$24.30

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Daily Shocker Deal
Polarstar CGS - CO2 Gas Stock 33g (Type 1)
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Polarstar CGS - CO2 Gas Stock 33g (Type 1)

$280.50

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Polarstar 13ci R3 Buttstrock for UGS

Polarstar 13ci R3 Buttstrock for UGS

$36.00

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SHS CNC Aluminum Hop-Up Chamber for M4/M16 Airsoft Rifles

SHS CNC Aluminum Hop-Up Chamber for M4/M16 Airsoft Rifles

$36.00$32.40

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SHS Hop-Up Chamber for M4/M16 Airsoft Rifles

SHS Hop-Up Chamber for M4/M16 Airsoft Rifles

$12.99$11.69

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SHS CNC Steel Ball Bearing Spring Guide for Version 2 Airsoft AEG Gearboxes

SHS CNC Steel Ball Bearing Spring Guide for Version 2 Airsoft AEG Gearboxes

$13.99$12.59

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SHS CNC Steel Ball Bearing Spring Guide for Version 3 Airsoft AEG Gearboxes

SHS CNC Steel Ball Bearing Spring Guide for Version 3 Airsoft AEG Gearboxes

$13.99$12.59

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SHS Silent Bore Up Piston Head for Version 2 Series Airsoft AEGs

SHS Silent Bore Up Piston Head for Version 2 Series Airsoft AEGs

$12.99$11.69

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Maxx Model Type F CNC Hardened Stainless Steel Airsoft AEG Cylinder 110-200mm

Maxx Model Type F CNC Hardened Stainless Steel Airsoft AEG Cylinder 110-200mm

$18.98$17.08

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Maxx Model Type E CNC Hardened Stainless Steel Airsoft AEG Cylinder 200-250mm

Maxx Model Type E CNC Hardened Stainless Steel Airsoft AEG Cylinder 200-250mm

$18.98$18.03

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Maxx Model Type D CNC Hardened Stainless Steel Airsoft AEG Cylinder 250-300mm

Maxx Model Type D CNC Hardened Stainless Steel Airsoft AEG Cylinder 250-300mm

$18.98$17.08

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Maxx Model Type C CNC Hardened Stainless Steel Airsoft AEG Cylinder 300-400mm

Maxx Model Type C CNC Hardened Stainless Steel Airsoft AEG Cylinder 300-400mm

$18.98$17.08

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SHS CNC Yaw Control Bar/Cut Off Lever for Version 2 Gearboxes

SHS CNC Yaw Control Bar/Cut Off Lever for Version 2 Gearboxes

$6.99$6.64

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SHS Version 2 Fire Selector Plate

SHS Version 2 Fire Selector Plate

$6.99$6.29

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SHS Aluminum Piston Head

SHS Aluminum Piston Head

$12.99$11.69

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SHS Silent Aluminum Piston Head

SHS Silent Aluminum Piston Head

$12.99$11.69

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SHS Imported Aerial Aluminum Piston Head

SHS Imported Aerial Aluminum Piston Head

$12.99$11.69

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SHS Polycarbonate 14 Teeth AEG Piston Teeth

SHS Polycarbonate 14 Teeth AEG Piston Teeth

$6.99$6.29

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SHS Lightweight Polycarbonate Vented 14 Teeth AEG Piston Teeth

SHS Lightweight Polycarbonate Vented 14 Teeth AEG Piston Teeth

$15.99$14.39

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SHS 32:1 Steel Gear Set for Airsoft AEGs

SHS 32:1 Steel Gear Set for Airsoft AEGs

$19.99$17.99

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SHS 16:1 Steel Gear Set for Airsoft AEGs

SHS 16:1 Steel Gear Set for Airsoft AEGs

$19.99$17.99

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SHS Wiring Hardness for M4/M16 Series Airsoft AEG Rifles

SHS Wiring Hardness for M4/M16 Series Airsoft AEG Rifles

$6.99$6.29

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HK Army 62ci/3000 PSI Aluminum Compressed Air Tank (Black)

HK Army 62ci/3000 PSI Aluminum Compressed Air Tank (Black)

$59.95$53.96

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HK Army 26ci/3000 PSI Aluminum Compressed Air Tank (Black)

HK Army 26ci/3000 PSI Aluminum Compressed Air Tank (Black)

$55.00$49.50

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Gate Nova 2E1 CNC Machined Aluminum Adjustable Trigger (Matte Dark Earth)

Gate Nova 2E1 CNC Machined Aluminum Adjustable Trigger (Matte Dark Earth)

$29.06$26.15

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HK Army HSTL 68ci/4500 PSI Carbon Fiber Tank (Red)

HK Army HSTL 68ci/4500 PSI Carbon Fiber Tank (Red)

$149.95$134.96

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Archwick Aluminum Type 2 Single O-Ring Piston Head

Archwick Aluminum Type 2 Single O-Ring Piston Head

$20.99$18.89

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Archwick Aluminum Type 1 Double O-Ring Piston Head

Archwick Aluminum Type 1 Double O-Ring Piston Head

$20.99$18.89

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Archwick 7/8 Cut Aluminum Ribbed Airsoft AEG Cylinder

Archwick 7/8 Cut Aluminum Ribbed Airsoft AEG Cylinder

$21.49$19.34

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Archwick M120 Stainless Steel Airsoft AEG Upgrade Spring

Archwick M120 Stainless Steel Airsoft AEG Upgrade Spring

$14.99$14.24

Save: $0.75
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Archwick M110 Stainless Steel Airsoft AEG Upgrade Spring

Archwick M110 Stainless Steel Airsoft AEG Upgrade Spring

$14.99$13.49

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Archwick Aluminum Cylinder Head for Version 2 Gearbox

Archwick Aluminum Cylinder Head for Version 2 Gearbox

$22.49$20.24

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Archwick 60 Degree Silicone Airsoft VSR-10 Hop-Up Bucking (Clear)

Archwick 60 Degree Silicone Airsoft VSR-10 Hop-Up Bucking (Clear)

$21.49$19.34

Save: $2.15
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Archwick 60 Degree Silicone Airsoft GBBR Hop-Up Bucking (Clear)

Archwick 60 Degree Silicone Airsoft GBBR Hop-Up Bucking (Clear)

$12.49$11.24

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Archwick 60 Degree NBR Rubber Airsoft GBBR Hop-Up Bucking (Black)

Archwick 60 Degree NBR Rubber Airsoft GBBR Hop-Up Bucking (Black)

$12.49$11.24

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Archwick 60 Degree Silicone Airsoft AEG Hop-Up Bucking (Blue)

Archwick 60 Degree Silicone Airsoft AEG Hop-Up Bucking (Blue)

$12.49$11.87

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Archwick 50 Degree Silicone Airsoft AEG Hop-Up Bucking (Clear)

Archwick 50 Degree Silicone Airsoft AEG Hop-Up Bucking (Clear)

$12.49$11.24

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ASG Steel Hammer Set for AAP-01 Gas Blowback Airsoft Pistols

ASG Steel Hammer Set for AAP-01 Gas Blowback Airsoft Pistols

$49.95$44.96

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ASG Infinity CNC U-30000 Motor (Long)

ASG Infinity CNC U-30000 Motor (Long)

$74.95$67.46

Save: $7.50
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Polarstar Kythera SA Replacement Disconnector

Polarstar Kythera SA Replacement Disconnector

$10.50

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Polarstar Kythera SA Nozzle #2

Polarstar Kythera SA Nozzle #2

$23.25

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PolarStar F2 HPA Engine Complete O-Ring Set

PolarStar F2 HPA Engine Complete O-Ring Set

$3.00

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Complete O-Ring Set for Polarstar Jack HPA Engines

Complete O-Ring Set for Polarstar Jack HPA Engines

$2.30

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PolarStar Complete O-Ring Set for Fusion Engine

PolarStar Complete O-Ring Set for Fusion Engine

$5.50

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Polarstar Low Flow F2 HPA Engine Poppet

Polarstar Low Flow F2 HPA Engine Poppet

$17.00

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Polarstar F2 Standard Aluminum Poppet (Red)

Polarstar F2 Standard Aluminum Poppet (Red)

$17.00

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Polarstar Fusion Engine Standard Poppet (Black)

Polarstar Fusion Engine Standard Poppet (Black)

$34.50

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PolarStar MR Micro Reg Gen 2 Micro Regulator Air Rig

PolarStar MR Micro Reg Gen 2 Micro Regulator Air Rig

$125.00

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PolarStar Jack AK Mini FCU Conversion Kit
qualifies for free shipping

PolarStar Jack AK Mini FCU Conversion Kit

$325.00

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PolarStar F2 HPA Version 3 AK Conversion Kit
qualifies for free shipping

PolarStar F2 HPA Version 3 AK Conversion Kit

$475.00

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Polar Star JACK HPA Conversion Kit For M4/M16
qualifies for free shipping

Polar Star JACK HPA Conversion Kit For M4/M16

$345.00

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PolarStar Fusion Engine M4/M16 Nozzle (Gold)

PolarStar Fusion Engine M4/M16 Nozzle (Gold)

$18.00

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PolarStar F2 V2 HPA Conversion Kit For M4
qualifies for free shipping

PolarStar F2 V2 HPA Conversion Kit For M4

$430.00

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Gate EON Reinforced Tappet Plate for Airsoft Version 2 AEG Gearboxes

Gate EON Reinforced Tappet Plate for Airsoft Version 2 AEG Gearboxes

$16.52$14.87

Save: $1.65
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Gate Eon Power Hybrid Piston Head For Airsoft AEG Gearboxes

Gate Eon Power Hybrid Piston Head For Airsoft AEG Gearboxes

$18.61$16.75

Save: $1.86
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Gate EON High Speed Piston Head for Airsoft AEG Gearboxes

Gate EON High Speed Piston Head for Airsoft AEG Gearboxes

$19.45$17.51

Save: $1.95
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Gate CNC Aluminum EON Protector Cylinder Head (Cyan)

Gate CNC Aluminum EON Protector Cylinder Head (Cyan)

$19.45$17.51

Save: $1.95
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ASG Ultimate CNC Airsoft Infinity Short Axle Motor 35000 RPM

ASG Ultimate CNC Airsoft Infinity Short Axle Motor 35000 RPM

$64.95$58.46

Save: $6.50
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Lancer Tactical 7mm Precision Steel Gearbox Bearings (Pack of 6)

Lancer Tactical 7mm Precision Steel Gearbox Bearings (Pack of 6)

$9.99$8.99

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Lancer Tactical 7mm Solid Steel Gearbox Bushings (Pack of 6)

Lancer Tactical 7mm Solid Steel Gearbox Bushings (Pack of 6)

$4.49$4.04

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Lancer Tactical 8mm Solid Steel Gearbox Bushings (Pack of 6)

Lancer Tactical 8mm Solid Steel Gearbox Bushings (Pack of 6)

$4.49$4.27

Save: $0.22
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Lancer Tactical AK Motor Housing Screw Set

Lancer Tactical AK Motor Housing Screw Set

$2.99$2.69

Save: $0.30
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Lancer Tactical Metal Motor Housing for V3 Gearboxes (Silver)

Lancer Tactical Metal Motor Housing for V3 Gearboxes (Silver)

$9.99$8.99

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Lancer Tactical Trigger Connector for Version 3 AEG Gearboxes

Lancer Tactical Trigger Connector for Version 3 AEG Gearboxes

$3.99$3.59

Save: $0.40
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Lancer Tactical Polycarbonate Ventilated Piston Head for Airsoft AEGs (Blue)

Lancer Tactical Polycarbonate Ventilated Piston Head for Airsoft AEGs (Blue)

$5.99$5.39

Save: $0.60
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Lancer Tactical Polycarbonate Piston Head for Airsoft AEGs (Blue)

Lancer Tactical Polycarbonate Piston Head for Airsoft AEGs (Blue)

$4.49$4.04

Save: $0.45
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Lancer Tactical Lightweight CNC Aluminum Airsoft AEG Cylinder

Lancer Tactical Lightweight CNC Aluminum Airsoft AEG Cylinder

$8.99$8.09

Save: $0.90
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Lancer Tactical CNC Polished Aluminum Airsoft AEG Cylinder

Lancer Tactical CNC Polished Aluminum Airsoft AEG Cylinder

$9.99$9.49

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Lancer Tactical Aluminum Airsoft AEG Piston

Lancer Tactical Aluminum Airsoft AEG Piston

$11.49

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HK Army Aluminum Tank 48Ci/3000 PSI (Blue)

HK Army Aluminum Tank 48Ci/3000 PSI (Blue)

$49.95$47.45

Save: $2.50
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HK Army Aluminum Tank 48Ci/3000 PSI (Gun Metal)

HK Army Aluminum Tank 48Ci/3000 PSI (Gun Metal)

$49.95$44.96

Save: $5.00
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HK Army Aluminum Tank 48Ci/3000 PSI (Red)

HK Army Aluminum Tank 48Ci/3000 PSI (Red)

$49.95$44.96

Save: $5.00
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Lancer Tactical Polycarbonate Ventilated Piston Head for Airsoft AEGs (Red)

Lancer Tactical Polycarbonate Ventilated Piston Head for Airsoft AEGs (Red)

$5.99$5.39

Save: $0.60
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Lancer Tactical 14 Teeth Reinforced Aluminum Piston with CNC Steel Teeth (Red)

Lancer Tactical 14 Teeth Reinforced Aluminum Piston with CNC Steel Teeth (Red)

$19.99$17.99

Save: $2.00
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