The Springfield Armory XD Mod.4 OSP is a semi-automatic 9mm Luger pistol with a 4-inch barrel and a 10+1 round capacity. It has an optic-ready slide cut and a Melonite Black finish. Sights consist of a fiber optic front and a white dot rear, and the pistol includes a grip safety. 
 

Key Specifications 

• Brand: Springfield Armory 
• Model: XD Mod.4 OSP 
• Caliber: 9mm Luger 
• Action: Semi Auto 
• Capacity: 10+1 
• Barrel Length: 4 in 
• Color/Finish: Melonite Black 
   

Detailed Features 

• Optic-ready slide cut (OSP) 
• Fiber optic front sight and white dot rear sight 
• Grip safety 
• 4-inch barrel with Melonite finish 
• 10+1 round capacity

Owners of the Springfield XD Mod.4 in the 10-round configuration often pick it for compliance with magazine-restricted jurisdictions. Most find the grip and ergonomics identical to the higher-capacity version, which is a plus for those who own both.

The OSP optic cut draws the same praise as on other XD Mod.4 variants: a clean solution for mounting a micro red dot without additional machining. Some owners note the mounting footprint limits direct-mount options compared to more universal cuts.

Overall satisfaction tracks with the 16-round version. The trigger is the same divisive element, with some owners finding the reset acceptable and others wishing it were crisper. The Melonite finish is consistently called out as holding up well to regular handling.