Transferable H&K HK21K Machine Gun – Fleming Conversion
Registered Receiver • Belt-Fed • 7.62×51 NATO (.308) • Fully Transferable
Status: ATF eForm 3
Location: Florida
📩 Email for price and additional information: myfullautollc@gmail.comOffered for sale is a fully transferable Heckler & Koch HK21K machine gun, built on a registered receiver and converted by Fleming Firearms. This is a pre-May 19, 1986 transferable NFA machine gun, lawfully transferable to qualified individuals or dealers where permitted by law.
This HK21K is currently on ATF eForm 3, on my books as a licensed FFL/SOT, and physically in my possession in Florida. Clear photographs of receiver markings and configuration are posted, along with the asking price.
The HK21K is one of the most desirable transferable belt-fed machine guns available to civilian collectors and advanced shooters. Built on the proven roller-delayed blowback system developed by Heckler & Koch, the HK21 platform is known for durability, controllability, and sustained-fire capability. Fleming-registered receiver conversions are long established and widely respected within the Class III community.
This example is best described as a balanced shooter with strong collector upside, combining a transferable registered receiver with correct HK21 components and an authentic belt-fed configuration.
Technical Specifications
Manufacturer: Heckler & Koch
Model: HK21K
Conversion: Fleming Firearms
Registered Part: Registered Receiver
Fire Control: Fully Automatic
Caliber: 7.62×51 NATO / .308 Winchester
Feed System: Belt-Fed
Belt Type: Non-disintegrating belts (DM1 pattern)
Barrel: Quick-change FMP HK21 barrel
NFA Classification: Transferable Machine Gun
ATF Transfer Status: eForm 3
Inventory Location: Florida
Included with Sale
One belt
HK21 bipod
Only the items shown in the photographs
No carry handle included
No additional barrels, mounts, or accessories beyond what is pictured
Condition and Disclosure
Fleming-marked registered receiver
Mechanically sound and functional
Round count unknown
Not C&R eligible
Why This HK21K
Transferable belt-fed machine guns are extremely scarce
Registered receiver configuration offers long-term stability and desirability
Fleming conversions are documented, established, and widely accepted
Correct quick-change FMP HK21 barrel adds shooter value
Strong demand from both advanced shooters and long-term NFA collectors
Ideal balance of shootability and investment-grade scarcity
Pricing and Transfer Terms
Price posted
Serious inquiries only
Trades considered for other transferable machine guns
Dealer transfers via ATF Form 3
Individual transfers via ATF Form 4 where legally permitted
📩 Contact: myfullautollc@gmail.com
📍 Nationwide NFA transfer support available
📄 All federal, state, and local laws apply