Airsoft GI small logo

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.


Refine Search

68 items | Pg  1 
| Sort
| Display
Automatic Free Shipping On All Orders Over $179! Coupon code "2024" for 10% off!
Perun MOSFET for AUG Series AEG Gearboxes

Perun MOSFET for AUG Series AEG Gearboxes

$109.00

BUY NOW
Solink Slim AEG Brushless Motor

Solink Slim AEG Brushless Motor

$126.00

BUY NOW
MTW Advanced Electronics Kit

MTW Advanced Electronics Kit

$140.00

BUY NOW
Polarstar UGS CO2 Insert - 12g Milspec

Polarstar UGS CO2 Insert - 12g Milspec

$130.75$117.68

Save: $13.08
BUY NOW
Daily Shocker Deal
Polarstar UGS CO2 Insert - 33gMilspec

Polarstar UGS CO2 Insert - 33gMilspec

$111.00$99.90

Save: $11.10
BUY NOW
Daily Shocker Deal
Polarstar UGS Type 1 HPA (RS Spec)
qualifies for free shipping

Polarstar UGS Type 1 HPA (RS Spec)

$240.00

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

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

$149.95

BUY NOW
PolarStar MR Micro Reg Gen 2 Micro Regulator Air Rig

PolarStar MR Micro Reg Gen 2 Micro Regulator Air Rig

$125.00$112.50

Save: $12.50
BUY NOW
PolarStar MR Micro Reg Gen 2 Micro Regulator Air Rig w/ 42" Air Line

PolarStar MR Micro Reg Gen 2 Micro Regulator Air Rig w/ 42" Air Line

$176.25$158.63

Save: $17.63
BUY NOW
LayLax PROMETHEUS EG Hard Gearbox Shell Ver.2 (8mm)
qualifies for free shipping

LayLax PROMETHEUS EG Hard Gearbox Shell Ver.2 (8mm)

$185.00

BUY NOW
Gate TITAN BASIC MOSFET for V3 AEG

Gate TITAN BASIC MOSFET for V3 AEG

$135.85

BUY NOW
Classic Army M132 Micro Gun High Speed Upgrade Motor

Classic Army M132 Micro Gun High Speed Upgrade Motor

$130.00

BUY NOW
Gate WARFET Advanced Airsoft AEG Mosfet Control System

Gate WARFET Advanced Airsoft AEG Mosfet Control System

$107.78

BUY NOW
Modify Mod24X Solid Steel Cylinder Set

Modify Mod24X Solid Steel Cylinder Set

$135.00

BUY NOW
Atlas Custom Works WA Lightweight Airsoft GBB Bolt

Atlas Custom Works WA Lightweight Airsoft GBB Bolt

$100.00

BUY NOW
LCT Airsoft Version 3 Rear Wired 9mm Bearing Gearbox

LCT Airsoft Version 3 Rear Wired 9mm Bearing Gearbox

$126.00

BUY NOW
LCT Airsoft Version 3 Front Wired 9mm Bearing Gearbox

LCT Airsoft Version 3 Front Wired 9mm Bearing Gearbox

$126.00

BUY NOW
Gate TITAN V2 Front Wired Basic Module AEG MOSFET

Gate TITAN V2 Front Wired Basic Module AEG MOSFET

$120.75

BUY NOW
Gate TITAN V2 Rear Wired Basic Module AEG MOSFET

Gate TITAN V2 Rear Wired Basic Module AEG MOSFET

$120.75

BUY NOW
Super Shooter CNC Ver. 3 8mm Gear Box (Red)

Super Shooter CNC Ver. 3 8mm Gear Box (Red)

$120.00

BUY NOW
Echo 1 M14 Complete Gearbox w/ Torque Motor

Echo 1 M14 Complete Gearbox w/ Torque Motor

$130.00

BUY NOW
Echo 1 ER25 Complete Gearbox

Echo 1 ER25 Complete Gearbox

$120.00

BUY NOW
Siegetek Torque Elongated Gearbox 26.67 Ratio Gear Set

Siegetek Torque Elongated Gearbox 26.67 Ratio Gear Set

$140.00

BUY NOW
Modify S100 Tune Up Kit for MK5/MP5

Modify S100 Tune Up Kit for MK5/MP5

$111.30

BUY NOW
Siegetek Ver. 2/3 Torque Plus 40.91 Ratio Gear Set

Siegetek Ver. 2/3 Torque Plus 40.91 Ratio Gear Set

$140.00

BUY NOW
Siegetek Ver. 2/3 Torque 27.5 Ratio Gear Set

Siegetek Ver. 2/3 Torque 27.5 Ratio Gear Set

$140.00

BUY NOW
Siegetek Ver. 2/3 Revolution 14.09 Ratio Gear Set

Siegetek Ver. 2/3 Revolution 14.09 Ratio Gear Set

$140.00

BUY NOW
Modify S130 Torque Series Tune Up Kit for SIG552

Modify S130 Torque Series Tune Up Kit for SIG552

$121.90

BUY NOW
G&G Power Bolt for Tanaka M700/M24

G&G Power Bolt for Tanaka M700/M24

$104.00

BUY NOW
Modify S130 Tune Up Kit for Mk5

Modify S130 Tune Up Kit for Mk5

$121.90

BUY NOW
Modify S120 Tune Up Kit for 552

Modify S120 Tune Up Kit for 552

$116.60

BUY NOW
Modify S100 Tune Up Kit for AUG

Modify S100 Tune Up Kit for AUG

$111.30

BUY NOW
Airsoft Elite Full Tune Up Kit for VFC MK-43 LMG

Airsoft Elite Full Tune Up Kit for VFC MK-43 LMG

$130.00

BUY NOW
GATE TITAN II Bluetooth for Ver.2 Gearboxes (Rear Wired)

GATE TITAN II Bluetooth for Ver.2 Gearboxes (Rear Wired)

$148.35

OUT OF STOCK
Copyright © 2024 Airsoft GI
Disclaimer:

All airsoft guns are required to have the tip (1/4 inch) of the barrel permanently colored in blaze orange. No person may openly display or expose any imitation firearm (replica firearm), in a public place. The term "public place" means an area open to the public or exposed to public view and includes streets, sidewalks, bridges, alleys, plazas, parks, driveways, parking lots, automobiles, whether moving or not, and buildings open to the general public, including those that serve food or drink, or provide entertainment, and the doorways and entrances to buildings or dwellings and the grounds enclosing them.

Any person who changes, alters, removes, or obliterates any coloration or markings that are required for by any applicable state or federal law or regulation, for any imitation firearm (replica firearm), or device in any way that makes the imitation firearm (replica firearm) or device look more like a firearm is guilty of violating the state or federal law.

By accessing the Site, you certify that you are older than 18 years of age or the age of majority where you live, whichever is older; that you are the owner of any credit card used to purchase on items on the Site; that you are familiar with all local laws in your area affecting your legal right to access airsoft products; that any products you buy are for your own private enjoyment and that you will NEVER share these products with a minor in ANY WAY.