Upgrade Parts & Internals

Upgrade Parts & Internals – Boost your airsoft performance from the inside out

Want more accuracy, higher FPS or a smoother gearbox? With the right internal upgrade parts for airsoft replicas, you can get more out of every skirmish. Whether you play with an AEG, GBB or HPA platform, at Airsoft Legends you will find all the components you need to boost your replica's power, durability and responsiveness.

From MOSFET installation to gearbox upgrades, these parts are the heart of every technical build.

What does airsoft upgrade parts & internals include?

In this category, you will find a wide range of internal airsoft parts that will dramatically improve the performance of your replica.

Inner barrels & hop-up units – For maximum precision and range
Gearsets, pistons, tappet plates & cylinders – Wear-resistant upgrade parts for AEG gearboxes
Reinforced springs & spring guides – From M90 to M150 for optimal FPS tuning
Motors (high torque / high speed) – Do you prefer trigger response or ROF? You decide
Nozzles, shims, bearings & bushings – Small components, big impact on reliability
MOSFETs & wiring kits – Electronics upgrades for faster response and protection

Every technique has its own building blocks, whether you're tackling an AEG upgrade, a sniper tune or a DSG build.

Who are airsoft internals suitable for?

Internals are perfect for players who want to measurably improve their performance. Novice techs benefit from simple plug-and-play upgrades such as inner barrels or springs, while experienced airsofters focus on advanced builds with MOSFETs or high-torque motors. DMR and sniper users rely on precision parts for stable, consistent shots, while skirmishers who play intensively often want to reinforce their gearbox for long-term reliability. Those who want to refine their replica technically, step by step, will find the right basis in this category.

Why choose internal upgrades from Airsoft Legends?

Top brands such as Prometheus, Retro Arms, Gate, Maxx Model, Guarder, Cowcow Industries
Comprehensive compatibility overview – for V2, V3, GBB, HPA and more
Technical support via email or telephone – for questions before or during construction
Competitive stock and fast delivery – everything directly from our own warehouse

Frequently asked questions about internal upgrade parts

Can I install these parts myself?

Many parts such as springs or inner barrels are plug-and-play. MOSFETs or gearbox builds require some technical knowledge, but we are happy to advise you.

Which upgrade parts are suitable for my replica?

That depends on your platform (AEG, GBB or HPA) and the purpose of your upgrade. It is also important to know the brand and type of replica you have. An upgrade part for an M4 may not fit an AK. Please check the product specifications or contact us for advice.

Are internal upgrades necessary for better performance?

Absolutely. Internal upgrades determine your FPS, durability and cycle consistency. A good interior makes all the difference on the field.

What is the difference between high torque and high speed motors?

High torque motors deliver more power and are suitable for heavier springs. High speed motors give a higher ROF (rate of fire) with light tuning.

Buying guide: which internal upgrades are suitable for your replica?

Starter or novice tech → Choose a better inner barrel, hop-up bucking and an M90–M110 spring for immediate gains in accuracy.
AEG player who wants to shoot faster → Go for a MOSFET, high torque motor and low-resistance wiring.
DMR/sniper user → Select a precision barrel, air-seal nozzle, reinforced piston and stable spring guide.
Speedsoft player → Consider a high-speed motor, DSG parts and a light piston for maximum ROF.

Tip: always check the gearbox type (V2, V3, GBB or HPA) to ensure that each part fits seamlessly with your replica.

Internal upgrades fit perfectly into categories such as Hop-Up Units, Motors, Gearsets and Gearbox Shells, so you can easily build a complete technical platform without compatibility issues. This allows you to create a setup that is fully tailored to your technical level and playing style.

Take your performance to the next level – with Upgrade Parts & Internals, you can complete your loadout.