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Not mine/no affiliation, and he's a member here. You don't see to many of these out there and it's got the adjustable gas block. Good luck!!
HK 417 13" Barrel Assembly w/ Adj Gas Block - RARE : HK Parts at GunBroker.com
HK 417 13" Barrel Assembly w/ Adj Gas Block - RARE : HK Parts at GunBroker.com