Does it fit on a Sig Saurer p320 x5 legion? And does it need a adapter plate for mounting?

Name: Holosun 407COMP 6MOA Dot Sight
Brand: Holosun
SKU: HS407COMP
Availability: InStock

It might depend on your model, the X5 Legion comes with a DPP footprint as standard but it appears some might also have RMR mounting holes on them that would accept the 407C/507C series. In this case a spacer plate that adds the recoil lugs would still be recommended to reduce strain on the mounting screws.

Holosun 407COMP 6MOA Dot Sight

A Minimalistic Sight for Competitive Shooters

The Holosun 407COMP is built for competition speed, delivering fast target acquisition with a bold 6 MOA dot and a wide viewing window that keeps transitions smooth and sight tracking clean. Designed on the proven COMP housing, it stays light, fast, and focused on performance.

Machined from hard-anodized 7075 aluminum, the 407COMP is made to handle high round counts with Shake Awake, Memory Mode, and a side-loading CR1632 battery that swaps without losing zero. Add IP67 waterproofing and 5000G vibration resistance, and you get a competition optic that works as hard as you do.

Adapter available for picatinny rail mounting: Holosun Picatinny Rail Mount for 407C, 507C & 508T Models

Featured Holosun Technologies:

Specifications:

6 MOA dot for fast acquisition
Large viewing window
RMR footprint compatibility
Shake Awake technology with last setting recall
Housing Material: CNC machined 7075 T6 Aluminum
Battery Type: CR1632
Battery Life (Setting 6): Up to 100,000 hours
Adjustment per Click: 1MOA
W&E Travel Range: ±50 MOA
Brightness Settings: 8 Daylight & 4 NV Compatible
Vibration: 5000G
Waterproof Rating: IP67
Dimensions (in): 1.78 x 1.31 x 1.1
Window Size (in): 0.67 x 0.91
Weight (oz): 1.55
Limited Lifetime Warranty