The Aim Sports M4 Stock Lock Pin (Aim Sports part no. PJARSTKCPB) is a black steel pin designed for use with M4-pattern stocks in a California featureless buttstock configuration. Aim Sports builds it specifically to help lock an M4-pattern stock into a fixed, non-adjustable position, a common requirement for shooters building or maintaining a featureless rifle under California’s configuration rules. It’s a small, purpose-built part rather than a generic pin, so it’s worth confirming your stock model before ordering. For California builders navigating featureless requirements, getting this detail right matters.

Key Specifications

• Machined from steel.
• Finished in black.
• Designed specifically for use with M4-pattern stocks.
• Purpose-built to help configure a California featureless buttstock setup.

Frequently Asked Questions

What is this pin used for? It’s designed to help lock an M4-pattern stock into a featureless configuration to meet California compliance requirements.

Will this work with any stock? No, it’s designed specifically for use with M4-pattern stocks.

Buy the Aim Sports M4 Stock Lock Pin

Getting a featureless configuration right matters for California builders, and this Aim Sports pin is a purpose-built way to lock an M4-pattern stock into that setup. Order from our Lubbock, Texas gun shop and it ships fast to your door, along with more gun accessories and parts.