Aim Sports Steel Black Stock Lock Pin for M4 - PJARSTKCB

The Aim Sports Steel Black Stock Lock Pin for M4 is a straightforward replacement or upgrade component for AR-platform rifles and carbines. If your stock has come loose, won't stay seated, or you're building a new upper and lower, a quality stock lock pin keeps everything solid and aligned. This steel pin delivers the reliability you need without overcomplicating the job—it's the kind of small part that makes a real difference in rifle stability and handling.

Stock lock pins wear or get damaged over time, especially if you swap uppers and lowers or run your rifle hard. Having a solid replacement on hand—or swapping in a fresh pin during a build—takes seconds and eliminates wobble or play between the stock and buffer tube. The steel construction and black finish match standard mil-spec AR components, so it integrates seamlessly into most modern carbines and rifles.

Whether you're a competitive shooter, hunter, or tactical enthusiast, a reliable stock lock pin is one of those essentials that shouldn't be overlooked. It's inexpensive insurance against a loose stock in the field or at the range. Aim Sports keeps the design straightforward and effective—no unnecessary frills, just a part that does what it's supposed to.

Specifications

Frequently Asked Questions

Will this stock lock pin fit my AR-15 or M4 carbine?

Yes, this pin is designed for M4 and AR-platform rifles and carbines that use standard mil-spec stock and buffer tube assemblies.

What's the difference between a stock lock pin and a regular takedown pin?

A stock lock pin secures the stock to the buffer tube and keeps it from rotating or coming loose. A takedown pin controls upper and lower receiver separation. This is a stock-specific component.

Do I need tools to install it?

Installation is straightforward and requires no special tools—standard AR armorer knowledge is helpful but not required for a basic swap.