For AIRSOFT Use ONLY! Compatible with VFC/Umarex HK416D "V1"(old gen WITHOUT quick HOP-UP adjustable) GBB ONLY! Can NOT compatible with VFC/Umarex HK416D Gen2 GBB. Can NOT compatible with VFC/Umarex HK416A5 GBB.
● Product Brand : Z-Parts (Taiwan)
● Material : Steel.
● For third-party tactical handguard which was thinner, have to through the sling swivel at the gas block.