The Aim Sports PJARSTKCB Stock Lock Pin M4 Steel Black combines durable steel construction with practical design to secure your rifle stock quickly and reliably. Crafted from steel with a steel finish for lasting durability, this lock pin is tailored for M4 platforms, offering a precise 1.40" L length that fits compatible receivers with confidence. Its gray rails provide a subtle contrast while remaining rugged enough for field and range use, and the lock pin type ensures a secure, streamlined method for locking or unlatching the stock as needed. Whether youre performing maintenance, upgrades, or field adjustments, this component delivers dependable performance without adding bulk or complexity, enabling smooth operation and quick action when you need to make on-the-fly changes. The PJARSTKCPB model is designed to integrate seamlessly with existing hardware, supporting productive workflows and consistent reliability during extended sessions or precision shooting. Trust in Aim Sports to supply a purpose-built solution that prioritizes strength, simplicity, and dependable fit for your rifle setup.