Stripped 5.00″ Slide for FN 509 – ACRO / MPS Optic Cut
This is a direct-replacement, stripped slide for the FN 509 platform, configured with an ACRO / MPS footprint optic cut and suppressor-height black-on-black sights installed by the manufacturer. Designed for shooters running a 5″ barrel who need a dedicated optics-ready slide without modifying the factory unit. The slide is stripped – you supply all factory internals, barrel, and optic. Ports on the slide top are functional only when paired with the manufacturer’s ported barrel; otherwise, they are cosmetic.
Compatibility
- FN 509 Compact – not compatible
- FN 509 Full-Size (standard 4″ slide) – not compatible
- FN 509 Tactical / Midsize – not compatible
- FN 509 5″ barrel models – direct fit
- Accepts all factory FN 509 internals (extractor, firing pin, spring cups, etc.)
- Works with factory 5″ barrel, manufacturer’s direct-drop-in barrel (105-073), threaded barrel (105-074), or ported barrel (must use ported barrel for port function)
- All manufacturer’s FN 509 aftermarket parts (triggers, springs, etc.) fit this slide
Key Features
- Length: 5.00″
- Optic cut: ACRO / MPS footprint (no adapter plate required)
- Sights: Suppressor-height black-on-black, installed
- Cocking serrations: Front and rear – choose Classic or Lightning Bolt pattern
- Finish: Black PVD
- Ports: Slide-top ports matched to manufacturer’s ported barrel (ported barrel required for gas-venting function)
- Stripped – no internal parts, barrel, or optic included
Install Difficulty
Difficulty: 3 / 5
Tools needed: armorer’s punch set, roll pin starter, non-marring mallet, barrel bushing wrench (if using factory barrel). Requires full disassembly/reassembly of your existing slide’s internals or sourcing new factory components. If not comfortable, order a Slide Completion Kit from the manufacturer (must be purchased with this slide and installed by them).
FAQ
Can I use my factory 4″ barrel with this slide?
No. This slide is cut for a 5″ barrel only. You must use a factory 5″ barrel or one of the manufacturer’s 5″ drop-in barrels.
Will my existing optic (RMR/Holosun) fit this cut?
No. This slide is cut specifically for the ACRO / MPS footprint (Aimpoint ACRO, Steiner MPS, or similar). It will not accept RMR, DPP, or Shield pattern optics without an adapter plate (not included).
Do the slide ports work with a non-ported barrel?
No. The ports on top of the slide are designed to align with the manufacturer’s ported barrel. With a standard barrel, they are cosmetic only and will not reduce muzzle rise.
Shipping: Ships within 1–3 business days. Warranty: This slide carries the manufacturer’s standard warranty against defects in material and workmanship. No returns on stripped slides once installed.
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