The SHORT RECOIL SYSTEM is an optional extension for the SARB-15 kit, designed exclusively for Airsoft GBB platforms. 
 
It allows you to retain the original BCG and convert various AR/M4 GBB systems into a bullpup configuration. 
 
With the extension installed, the length of pull reaches 16.3", aligning with standard bullpup proportions. Thanks to smart ergonomic design, handling remains natural and comfortable. 
 
KIT Includes:
Rear stock extension adapter (SLS 3D Fusion printed)
Short tube extension
CNC short buffer
Short recoil spring
 
Note:
The gold short buffer tube, end cap, and rubber butt pad are reused from the original SARB-15 kit.
This kit does not include a BCG; please use your original BCG.