The Nuprol Gear Shim Set is a set of essential precision shims designed for tuning and maintaining AEG (Automatic Electric Gun) gearboxes. Whether you’re rebuilding, repairing, or upgrading your airsoft rifle’s internal gearbox, these shims give you the flexibility needed to correctly align the gear train so your internals run smoothly and reliably.
 
What It Is
Gear shims are thin, flat metal spacers that sit between the gear axles and gearbox shell to fine‑tune the spacing of the bevel, spur, and sector gears inside your AEG. Proper shimming ensures correct gear alignment, reduces noise, prevents excess wear, and improves overall gearbox performance. 
 
Key Features
Essential Airsoft Tech Part: A must‑have set for anyone servicing, upgrading, or building an AEG gearbox.
Precision Spacers: Helps achieve optimal gear placement and spacing for smooth rotation and efficient power transfer.
Versatile Use: Ideal for V2, V3, and other standard gearbox types — allows adjustment of lateral gear play to eliminate grinding and noise.
Simple to Use: Easy to install during gearbox assembly; shims are placed on gear axles to fine‑tune lateral movement and ensure correct mesh. 
Lightweight Add‑on: Adds negligible weight yet significant performance and reliability benefits.