This steel optic mount replaces the factory Sig Sauer P320 cover plate on slides with the RX Classic or RX Pro cut, solving the problem of insecure optic mounting and slide gap misalignment when fitting Aimpoint ACRO P-1/P-2, Steiner MPS, or Lead & Steel Pandora PB-3 optics. The mount includes an Optic Sub Plate that allows the ACRO locking bar to fully engage, preventing screw walk and zero shift under hard use. Machined from billet steel with a black oxide finish, it provides a rigid, corrosion-resistant interface that maintains slide-to-optic alignment during recoil.
Compatibility
- Sig Sauer P320 RX Classic cut slides (factory optic-ready, no “-R2” in SKU)
- Sig Sauer P320 RX Pro cut slides (full-length optic cuts)
- Aimpoint ACRO P-1
- Aimpoint ACRO P-2
- Steiner MPS
- Lead & Steel Pandora PB-3
- Retains factory Loaded Chamber Indicator (LCI) function
- Does NOT fit P320 slides with rev2 (“-R2”) cut – use part #112-009 for those
Key Features
- Billet steel construction with black oxide finish – no zinc or polymer
- Included Optic Sub Plate ensures full ACRO locking bar engagement
- Prevents optic walking and zero shift from slide cycling
- Direct replacement for factory cover plate – no slide modification required
- Maintains LCI clearance for standard factory operation
Install Difficulty: 2/5
Requires: T10 Torx driver, small flathead screwdriver (for LCI removal if present), blue Loctite (provided). Remove factory cover plate, transfer LCI if equipped, apply Loctite to mount screws, torque to 15 in-lbs. Mount optic per optic manufacturer specs. Estimated time: 10–15 minutes.
FAQ
Will this mount work with a P320 X-Five Legion?
Yes, if the slide has the RX Classic cut (factory optic-ready without “-R2” marking). The X-Five Legion uses this cut. If your Legion has the newer rev2 cut with “-R2” in the SKU, use part #112-009 instead.
Does the Optic Sub Plate come pre-installed?
Yes. The sub plate is factory-installed on the mount. You do not need to remove it – simply attach the mount to your slide, then mount the optic using the screws provided with your ACRO/MPS/Pandora.
Will this mount work with suppressor-height sights co-witnessing?
Yes. The mount does not alter sight plane height. Standard suppressor-height sights (e.g., Sig X-Ray3 suppressor-height) will co-witness through the ACRO or MPS window as normal. No additional shims required.
Ships within one business day. All Apex mounts carry a limited lifetime warranty against manufacturing defects. Return within 30 days if not compatible – verify slide cut markings before ordering.
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