The Springfield Armory XD Mod.4 OSP is a semi-automatic 9mm Luger pistol with a 4-inch barrel and a 16+1 round capacity. It has an optic-ready slide cut (OSP) and a Melonite Black finish. The pistol includes a fiber optic front sight, a white dot rear sight, and a grip safety. 
 

Key Specifications 

• Brand: Springfield Armory 
• Model: XD Mod.4 OSP 
• Caliber: 9mm Luger 
• Action: Semi Auto 
• Capacity: 16+1 
• Barrel Length: 4 in 
• Color/Finish: Melonite Black 
   

Detailed Features 

• Optic-ready slide cut (OSP) for mounting micro red dots 
• Fiber optic front sight and white dot rear sight 
• Grip safety 
• 4-inch barrel with Melonite finish 
• 16+1 round capacity

Owners of the Springfield XD Mod.4 generally praise the grip ergonomics and the included grip safety, which gives the platform a distinct feel among polymer striker pistols. The fiber optic front sight is frequently called out as a real-world improvement for target acquisition.

The OSP optic cut is well-received by those who want to run a red dot without gunsmithing. Some owners note the cut footprint is proprietary to Springfield's mounting pattern, which limits direct-mount options compared to more universal cuts.

Value perception is positive given the 16-round capacity and included features. The trigger draws mixed reviews: some find the reset crisp, others consider it mushy compared to competitors. The Melonite finish is consistently mentioned as durable and low-maintenance.