Apex Optic Mount for ACRO/MPS* – Sig P320 RX and RX Pro

Description

The Apex Optic Mount is built for shooters who run their gear hard in demanding environments. Machined from a single billet of steel and finished with a black oxide coating, this mount provides a solid, corrosion-resistant platform for attaching an Aimpoint ACRO P-1, P-2, Steiner MPS, or Lead & Steel Pandora PB-3 to a Sig Sauer P320 slide with the factory RX Classic or RX Pro optic cut.

For Arizona desert conditions, this mount offers real advantages. The steel construction handles the thermal expansion and contraction cycles you get from a hot slide cooling in the shade or running suppressed. The black oxide finish resists the fine dust that gets into everything, and the mount’s design keeps the optic locked in place through rapid fire and hard recoil. The included Optic Sub Plate ensures the ACRO locking bar fully engages the mount, preventing the optic from shifting or walking loose under heavy use—a common failure point with lighter mounts or adapters.

Key benefits for your setup:

• Steel billet construction – Drops into the P320 RX or RX Pro cut without adapters or shims. Holds zero through heat, dust, and suppressor backpressure.
• Black oxide finish – Reduces glare and provides a tough, low-maintenance surface that stands up to abrasive dust and cleaning solvents.
• Optic Sub Plate system – Allows the ACRO’s locking bar to fully engage, eliminating optic creep even with a suppressor running heavy gas and carbon buildup.
• Loaded chamber indicator compatible – Works with factory LCI slides, so you don’t lose that visual reference.
• Model-specific fit – Designed only for P320 slides with the RX Classic or RX Pro cut. If your P320 has the rev2 slide cut (look for “-R2” in the SKU), use part #112-009 instead.

Fitment details:
This mount accepts Aimpoint ACRO P-1, P-2, Steiner MPS, and Lead & Steel Pandora PB-3 optics. Installation is direct to P320 slides with the RX Classic or RX Pro cut—no additional plates required. The mount is steel, not aluminum, so you get the durability needed for high-round-count shooting in a suppressor-friendly state like Arizona. At $75, it’s a straightforward upgrade that keeps your optic secure through summer heat, dust storms, and extended range sessions.