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

This steel optic mount replaces the factory cover plate on Sig Sauer P320 slides with the RX Classic or RX Pro cut. It provides a secure mounting solution for enclosed emitter optics, addressing the common problem of optic walking under recoil. The mount includes a sub-plate that allows the ACRO locking bar to fully engage, preventing shift during heavy use. Machined from billet steel with a black oxide finish.

Compatibility

• Sig Sauer P320 with factory RX Classic cut (full-size, carry, compact slides)
• Sig Sauer P320 with factory RX Pro cut (X-Five, X-Carry, X-Compact slides)
• Does NOT fit P320 slides with rev2/R2 cut (use part #112-009 for those)
• Works with factory Loaded Chamber Indicator (LCI) equipped slides
• Optics: Aimpoint ACRO P-1, ACRO P-2, Steiner MPS, Lead & Steel Pandora PB-3

Key Features

• Billet steel construction, black oxide finish
• Included Optic Sub Plate enables full ACRO locking bar engagement
• Direct replacement for factory RX/RX Pro cover plate
• Maintains factory LCI function
• Model-specific – verify slide cut before ordering

Install Difficulty: 2/5

Requires: Torx T10 driver, thread locker (blue Loctite 242 recommended), torque wrench (15-18 in-lbs for mount screws). Remove factory plate, clean slide surface, apply thread locker, mount optic to sub-plate, then mount assembly to slide.

FAQ

Will this mount fit my P320 X-Five Legion?

If your slide has the RX Pro cut (no “-R2” in the SKU), yes. Legion models with the rev2 cut require part #112-009.

Does this work with the factory iron sights?

No. This mount replaces the rear sight assembly. You will need suppressor-height or optic-height front and rear sights for co-witness.

Can I use this with a Romeo1 or Deltapoint Pro?

No. This mount is specifically for Aimpoint ACRO P-1/P-2, Steiner MPS, and Lead & Steel Pandora PB-3. Other optics require different mounting solutions.

Shipping: All orders ship within 1-2 business days. Warranty: Manufacturer defects covered for 1 year from purchase. Modification or improper installation voids warranty.