Harrington & Richardson Model 606 5.56 NATO Semi-Auto Rifle - 20 in Heavy Barrel, Slick-Side Upper, Fixed Carry Handle, Clamp-On M2 Bipod
This H&R Model 606 is a U.S.-made, 2026 production semi-automatic AR-15 platform rifle that reproduces the Model 606 configuration with early features including a slick-side upper, fixed carry handle with A1 rear sight, three-prong flash hider, and a barrel-mounted clamp-on M2-style bipod that secures with a split band and screw just behind the three-prong flash hider. It comes with its factory box whose end label matches the rifle's serial, the Model 606 manual, and one straight-body 20-round magazine.
Condition
Overall Condition: As-new condition with no signs of prior handling beyond what's typical from inspection (see photos).
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Light, superficial handling marks are present on exterior surfaces from normal inspection and storage; see photos for close-ups.
What's Included
- Harrington & Richardson Model 606 semi-automatic rifle (5.56mm NATO)
- 1x 20-round straight-body aluminum AR-15 magazine
- H&R factory cardboard box with end label matching the rifle's serial
- Harrington & Richardson Model 606 rifle manual
The receiver setup mirrors early-pattern attributes: a slick-side upper without forward assist or brass deflector and a fixed carry handle with an A1-style rear sight. The lower is rollmarked with the H&R lion crest and "PROPERTY OF U.S. GOVT / M16 / CAL. 5.56MM." Selector markings show SAFE–SEMI–AUTO on a semi-automatic receiver with a manual safety selector.
The 20-inch steel heavy barrel uses a fixed front sight base and a threaded muzzle wearing a three-prong flash hider. Operation is semi-automatic with a direct impingement gas system.
Furniture includes a one-piece cylindrical vented handguard retained by a straight slip ring, a fixed black polymer stock with rear sling swivel, and an A1-style pistol grip. A distinctive barrel-mounted clamp-on folding M2-style bipod with ski feet and an integral front sling loop is installed.
Capacity is 20+1 when using the included 20-round magazine. This is a recent H&R release produced in the USA in 2026, and the factory box end label matches the rifle's serial for documentation consistency.