GHK M4 V2 Bolt Carrier and Magnetic Bolt Lock Kit for GHK M4 Gas Blowback Rifles, Accessories & Parts, Gas Gun Parts, Gas Rifle Bolts - Evike.com Airsoft Superstore
Arrow Arms] HK416A5 CNC Aluminium Conversion Kit[For Tokyo Marui M4 M – SIXmm (6mm)
SRU 3D Printed Bullpup Conversion kit for GHK G5 Gas Blowback Rifle (Color: OD Green), Accessories & Parts, Gas Gun Parts, Gas Gun Conversion Kits - Evike.com Airsoft Superstore
GHK AEG to GBB conversion kit - Airsoft Communi...
Angry Gun RD704 GT SBR Style M-LOK Handguard Rail Conversion Kit for Marui TM AKM GBB Series