The Kleenbore Accu-Wedge Receiver Buffer System is a drop-in mechanical buffer designed to eliminate movement, play, and wobble between the upper and lower receiver halves of standard AR-15, M16, and M4 pattern rifles. Manufactured from a resilient moulded thermoplastic polymer and synthetic rubber compound, the sub-ounce wedge seats directly beneath the rear takedown pin lug inside the lower receiver. Once the rifle is closed, it applies upward mechanical tension against the upper receiver lug to create a firm, rattle-free fit while simultaneously buffering contact surfaces during cycling without requiring gunsmithing or permanent alterations.

Key Features

• Play Elimination: Seats under the rear takedown pin lug to apply constant upward tension, removing receiver slop between upper and lower halves.
• Drop-In Installation: Requires no tools, machining, or permanent modifications to the firearm.
• Vibration Damping: Synthetic rubber compound absorbs cycling vibration and buffers contact surfaces to minimize wear.
• Mil-Spec and Commercial Fit: Formed to match the interior dimensions of standard AR-15, M16, and M4 lower receivers.

Specifications

• Platform Compatibility: AR-15, M16, and M4 pattern lower receivers (mil-spec and commercial dimensions)
• Material: Moulded thermoplastic polymer / synthetic rubber compound
• Installation Location: Lower receiver cavity beneath the rear takedown pin
• Operation: Passive mechanical tension buffer (unpowered)
• Weight: Sub-ounce drop-in component

Who is the Kleenbore Accu-Wedge Receiver Buffer System for?

• Target shooters using AR-15 pattern rifles — requires a sub-ounce drop-in AR-15 receiver tension wedge that seats beneath the rear takedown pin to remove mechanical receiver play on standard .223 Rem and 5.56 NATO frame dimensions.
• Professional and occupational permit holders — operates standard mil-spec or commercial AR-15 pattern lower receivers and requires a resilient thermoplastic polymer receiver tension wedge to buffer contact surfaces and eliminate receiver wobble without permanent modifications.

Less suitable for: Owners of larger .308 Winchester or AR-10 pattern receivers, or rifles featuring zero-tolerance, matched, or tension-screw-equipped billet receiver sets where standard polymer wedges cause over-tight pin closure; these platforms require calibre-specific AR-10 receiver tensioning hardware or factory-integrated receiver tension screws.