Will the Harris #5 Adapter fit my vintage M16A1 rifle with triangular handguards?

No, the Harris #5 Adapter is specifically engineered for standard two-piece round polymer handguards like those found on M4-style forends. It will not fit vintage triangular or teardrop M16A1-style handguards.

Do I need to drill permanent holes into my AR-15 handguard to install the HADAP5?

No drilling or permanent modification is required. The adapter features a perforated curved flange backing plate that nests inside the standard circular handguard ventilation holes, allowing you to thread the sling swivel stud directly into place.

Which Harris bipods are compatible with this adapter?

The Harris #5 Adapter is compatible with all Harris 1A2 and S-series swivel bipods, as well as any standard QD sling-stud-mounted bipod. For instance, it pairs effectively with popular models in our range like the Harris HS-BR 6 to 9-inch swivel bipod or the Harris HS-L 9 to 13-inch adjustable bipod.

Are there any specific firearms permits or regulatory restrictions required to purchase this adapter in Australia?

No, the Harris #5 Adapter is an unpowered mechanical firearm accessory and is completely unrestricted. It can be legally purchased, shipped, and owned across all Australian states and territories without requiring a permit.

Harris HADAP5 Bipod Adapter - Harris HADAP5

The Harris #5 Adapter (HADAP5 / HB5) is a dedicated bipod mounting adapter designed to attach Harris bipods directly to standard military-style round AR-15, M16, and M4 polymer handguards. Made in the USA from heat-treated high-carbon steel and aluminum alloy with a black anodised/black oxide finish, this micro-hardware kit installs directly into standard handguard ventilation holes without requiring permanent modification or drilling. It supplies a standard quick-detach (QD) sling swivel stud that provides a stable, rigid forward mounting platform for shooting accessories while preserving front sling functionality.

Key Features

No-Drill Installation: Features a curved, perforated backing plate that nests inside standard circular handguard vent holes without modifying the factory forend.
Universal Harris Compatibility: Fully compatible with all Harris 1A2 solid-base bipods and S-series swivel bipods, as well as standard sling-swivel-mounted accessories.
Durable Construction: Fabricated from heat-treated high-carbon steel and aluminum alloy to withstand firearm heat and standard AR-pattern recoil envelopes.
Included QD Sling Swivel: Supplied with a detachable quick-detach sling swivel loop for retaining rifle sling use when a bipod is not attached.
Regulatory Status: As an unpowered mechanical accessory, it is completely unrestricted for purchase and ownership across all Australian states and territories.

Specifications

Product Name: Harris Engineering #5 Adapter for AR-15 Style Round Handguards
Model Number: HADAP5 / HB5 / #5 ADAPTER
Handguard Fitment: Standard two-piece round polymer handguards (e.g., standard A2 round handguards, M4 round forends)
Bipod Interface: Standard QD sling swivel stud (fits all Harris 1A2 and S-series bipods)
Material: Heat-treated high-carbon steel and aluminum alloy
Finish: Black anodised / black oxide
Country of Origin: Made in the USA

Who is the Harris #5 Adapter - For Ar-15 Style Round Handguards for?

AR-15 owners with round polymer handguards — requires a zero-drill mounting solution that drops directly into round handguard ventilation holes to anchor any standard 1A2 or S-series bipod mounting adapter.
Shooters outfitting standard M4-style forends — needs a two-piece round polymer forend attachment to mount standard QD-stud accessories without adding bulky rail conversion systems.

Less suitable for: Owners of firearms featuring vintage triangular or teardrop M16A1 handguards, or modern forends equipped with M-LOK, KeyMod, or MIL-STD-1913 Picatinny rails; these platforms require dedicated direct-attach M-LOK QD sling studs or Picatinny rail bipod adapters instead.

SKU	HR40928LP
Model #	HADAP5
Brand	Harris
Shipping Weight	1.0000kg

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Harris Hadap5 Bipod Adapter For Round Handguards Steel Black

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