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AR-15 80% Lower

Product Code: OD001
Availability: Out Of Stock
Price: $229.00
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Optimus Defense AR-15 80% Lower was designed for the tactical and precision shooter who wants a lower capable of performing to the highest level. Several months of design, manufacturing, and testing went into the development of this product to create one of the best AR-15 80% Lowers.

  • Precision machined out of 7075-T651 aluminum plate by a California company that manufactures parts for major aerospace companies.
  • Flared and slightly oversized magwell with a 25 degree taper angle for smooth/fast magazine loading/unloading of both mil-spec metal magazines and also polymer magazines (tend to be slightly larger).
  • Front of receiver is about 1/2" longer than mil-spec to allow for a better hold when using gloves or if you have big fingers.
  • Solid and oversized winter trigger guard that is compatible with most gloves.
  • Reinforced around buffer tube thread.
  • Exterior edges are CNC chamfered to eliminate sharp corners or edges that can snag on clothing/gear or be uncomfortable to your hands.
  • Tight fit (small side of mil-spec tolerances) for pivot & take-down pin holes, upper receiver lug slots, and upper mating profile. Reduces slop and rattle of lower to upper interface.
  • Optional mil-spec or easy install Pivot Pin Detent force.
  • Vibro finished to remove sharp edges and machining marks.
  • Marked: CAL. MULTI
  • Compatible with mil-spec lower parts.
  • Compatible with most pistol grips including grips that have a front tab, such as TangoDown grips.
  • Compatible with mil-spec metal magazine and polymer magazines including Magpul Gen3 PMAGs.

The lower was also designed to be easy for the user to complete the remaining machining necessary to make it a firearm.

  • Bottom of trigger guard is parallel to upper receiver mating face, which allows the lower to be leveled and clamped easily in a vice.
  • Slot for upper's rear take-down pin lug is already precision machined and chamfered for a tight fit.
  • Can be painted (Cerakote is recommended), anodized, or just left in the vibro finished condition.
  • Compatible with most AR-15 lower drill jigs, and specificly fits the Optimus Defense AR-15 Drill Jig.
  • CAD model for CNC programming.
  • Drawing for manual machining dimensions.
  • Drawing for inspection dimensions.
  • Completion Guides that shows how to maually mill or drill the receiver.

No FFL required. This item is not a firearm. This is not a complete receiver. Machining of the trigger pin hole, hammer pin hole, safety selector hole, fire-control pocket, and trigger slot has not been completed.

Optimus Defense has a letter from BATFE stating that this 80% Lower is not a firearm.

For each Optimus Defense AR-15 Lower purchased though this website, Optimus Defense will donate $20 to The Calguns Foundation.