Apex Optic Mount for ACRO/MPS* – Sig P320 Sig-LOC Slide Cut including M17 / M18 Models

Description

The Apex Optic Mount bridges the gap between your Sig Sauer P320 and today’s top enclosed emitter optics. Designed specifically for the P320 platform with the Sig-LOC / R2 slide cut — including the Legion, M17, and M18 models — this mount gives you a rock-solid foundation for your Aimpoint Acro P-1 or P-2, Steiner MPS, or Lead & Steel Pandora PB-3. At $65, it’s a direct path to a more reliable, corrosion-resistant red dot setup that holds zero through Florida humidity, salt spray, and daily carry demands.

Your EDC optic needs to stay clean and functional. The integrated rear sight version of this mount places a steel sight bridge in front of the optic window, which acts as a gas shield. This simple design detail keeps carbon, powder residue, and debris off your lens longer — meaning less wiping and more confidence between range sessions. The rear sight itself is engineered for a lower 25% co-witness through the optic window, so you retain iron sight capability without sacrificing your dot’s field of view. Note: you’ll need a tall front sight to complete the co-witness. Two sight height packages are available — select the one that matches your barrel length during checkout.

Built for the coastal carry lifestyle, this mount is finished to resist corrosion from sweat, rain, and sea air. It fits the factory Loaded Chamber Indicator without modification, so your P320’s visual and tactile chamber check stays intact. The mount secures directly to the slide using the Sig-LOC interface, eliminating the need for a separate adapter plate. That means a lower profile, fewer potential failure points, and a more direct connection between your optic and your pistol.

Specs & Fitment:

• Compatible slides: Sig Sauer P320 with R2 / Sig-LOC slide cut (includes P320 Legion, M17, M18, and other R2-cut models)
• Compatible optics: Aimpoint Acro P-1, Acro P-2, Steiner MPS, Lead & Steel Pandora PB-3
• Rear sight integration: Available with or without integrated rear sight. The integrated sight acts as a gas shield and co-witnesses in the lower 25% of the optic window
• Front sight requirement: Tall front sight required for co-witness. Two height options offered — select based on your barrel length
• Sight regulation: Point of aim equals point of impact at 15 yards