Description
This spring is an original part by VFC and is designed to work with VFC’s M4 GBB Airsoft rifle series. It is a simple drop and swap installation and does not require modifications to ensure proper fitment.
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Compatibility:
VFC M4 GBB Airsoft Rifle Series
Includes:
x1 VFC M4 GBB Retainer Spring (MK18 Part # 02-04, KS-1 Part # 04-11, MD9 Part # 02-05)


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