The Shield SMSc is the perfect red dot sight for your SIG P365. It is the slimmest optic on the market and fits the P365 slide with no overhang. It is also low profile and can be co-witnessed with the OEM sights. Shield makes very high quality optics and has a great reputation for ruggedness and reliability. The SMSc is always on, and auto adjusts to light conditions making it a great choice for your carry optic. Even though it is always on, the battery lasts 4 years! This package includes the Shield SMSc optic, milling of your slide and laser bore sighting. Please send the slide and the barrel.