Pro Arms Replacement Spring Set for SIG/VFC M17 GBB Warhammer 40k This Hop Up chamber is

This Hop Up chamber is a slightly redesigned version of Hop Up chamber BASIC

103A (STANDARD version with polymer body) is a replica of the Israeli-American assault rifle (military version with a SAFE/SEMI/AUTO fire modes) with improved ergonomics and handling compared to standard AKs

This is all done without sacrificing performance as well since this tiny regulator has a lightning fast recharge rate that is on par with its larger brother the MRS™

Electronic control system with a MOSFET

powerful 32-bit ARM M4 processor

Pro Arms Replacement Spring Set for SIG/VFC M17 GBB Warhammer 40k This Hop Up chamber isThis recoil spring by Pro Arms is designed for the VFC P226 MK25 GBB Airsoft pistol series. Machined from high quality spring steel, it is very durable and provides a strong rebound as the recoil spring is rated 130% spring strength. It is a simple drop in installation and does not require modification to install.