Transferable H&K HK21K Fleming Conversion – Registered Receiver – Full Auto Belt-Fed – 7.62×51 NATO (.308) - efile Form 3 in Florida
Offered for sale is a rare, transferable Heckler & Koch HK21K machine gun, built on a registered receiver and converted by Fleming Firearms. This is a fully transferable, pre-May 19, 1986 NFA machine gun, currently on a Form 3, on my books, and physically in my safe in Florida.
The HK21K is one of the most sought-after belt-fed machine guns in the transferable NFA market, known for its durability, smooth operation, and iconic roller-delayed H&K design. Fleming-marked registered receivers are well regarded and widely accepted within the Class III community.
Key Specifications
• Manufacturer: Heckler & Koch
• Model: HK21K
• Conversion: Fleming Firearms
• Registered Part: Registered Receiver
• Action: Full Auto
• Caliber: 7.62×51 NATO / .308 Winchester
• Feed System: Belt-fed
• Registration Status: Fully transferable NFA machine gun
• ATF Status: On Form 3
• Location: Florida, on my books, in my possession
Included
• One belt
• Only the items shown in the photos
• No additional accessories, barrels, or mounts beyond what is pictured
Condition & Markings
• Fleming-marked receiver
• Mechanically sound
• Unknown round count
• Not C&R eligible
Why This HK21K
• Transferable belt-fed machine guns are extremely scarce
• Registered receiver configuration, not a sear or post-sample
• Fleming conversions are established and respected
• Outstanding shooter and serious long-term collector asset
• Strong demand in both dealer and private NFA markets
Price & Terms
• Fixed price or Best Offer
• Serious offers accepted via email
• Trades considered for other transferable machine guns
• Dealer-to-dealer Form 3 transfer available
• Civilian transfer via Form 4 where legal
📩 Contact: myfullautollc@gmail.com
📍 Nationwide transfer support available
📄 All NFA rules, federal, state, and local laws apply