The Holosun 407K/507K adapter plate for Glock MOS (part no. KPLT-MOS9MM) mounts a Holosun 407K or 507K micro reflex sight to a factory Glock MOS-cut slide. Holosun sizes the plate at 1.65 x 2.15 x 2.70 inches for a direct fit, though the adapter excludes the Glock 43X’s slightly different MOS pattern. Among Glock MOS-specific red dot mounts, this 407K/507K adapter is a purpose-built accessory for those two micro optics.

Key Specifications

• This adapter fits the 407K and 507K micro reflex sights specifically.
• The fitment is Glock MOS, matching that factory milling pattern.
• The overall dimensions measure 1.65 x 2.15 x 2.70 inches, keeping the footprint compact.
• The adapter excludes the Glock 43X, which uses a different MOS pattern.

Frequently Asked Questions

Does this adapter fit the Glock 43X? No, the 43X uses a different MOS pattern that this adapter excludes.

Which optics does this adapter fit? The Holosun 407K and 507K micro reflex sights.

Buy the Holosun 407K/507K Adapter, Glock MOS

A Glock MOS slide running a 407K or 507K gets a direct-fit adapter here, sized for that specific footprint. This adapter is temporarily unavailable to ship immediately — order confirmation and availability updates are handled at checkout, and our Lubbock, Texas gun shop will get it to you with fast, insured shipping as soon as it’s ready.