The Sig Sauer P365 is a micro-compact striker-fired pistol chambered in .380 ACP with a 10+1 capacity. This variant carries a Rainbow Titanium slide over a black polymer frame, giving it a visually distinct look while the underlying spec sheet matches the standard P365 platform. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model Name: P365 
• Caliber: .380 ACP 
• Action: Striker-fired semi-auto 
• Capacity: 10+1 rounds 
• Barrel Length: 3.1 inches 
• Overall Length: 5.80 inches 
• Weight: 2.25 lbs (15.70 oz empty) 
• Sights: XRay3 Day/Night Sights 
• Grip Type: Standard polymer grip 
• Trigger Type: Standard curved trigger 
• Safety Feature: Manual thumb safety 
• Finish Color/Material: Rainbow Titanium slide with black polymer frame 
• Condition: New in Box 
   

Detailed Features 

The 3.1-inch barrel and 5.80-inch overall length make the P365 easy to conceal. At 15.70 oz empty, it stays light enough for all-day carry. XRay3 day/night sights use tritium inserts for reliable target acquisition in dim conditions without needing any additional tools. The manual thumb safety is an optional layer of retention that does not interfere with the standard striker-fired draw if left disengaged. The Rainbow Titanium finish is purely aesthetic. It does not change durability or function compared to the standard nitron finish. 
 
The 10+1 capacity in a micro-compact frame is the core reason the P365 platform caught on in the first place. This variant gives that same package a more personalized appearance.

Owners of the Rainbow Titanium P365 tend to fall into two groups: those who bought it primarily for the finish, and those who wanted the P365 platform and were drawn to the variant. Both groups generally report the same performance characteristics as any other P365.

Positives track closely with the standard model: compact size appreciated for carry, smooth trigger pull noted by experienced shooters, and XRAY3 sights cited for improving low-light performance. General reliability across different ammunition types comes up consistently.

Criticisms are also similar: some users wish the magazine capacity were higher compared to larger guns or other compacts at similar price points, and the .380 ACP chambering gets pushback from those who prefer a more powerful defensive round. Ergonomics are mostly praised, though a few note the grip does not fit all hand sizes equally. Aftermarket accessories specific to the P365 are more limited than for the most common platforms.