Cross Armory CRSL Stock Lock Converter 7075-T6 Aluminum Black AR-15/M4

The Cross Armory CRSL Stock Lock is a non-permanent stock adapter that converts an adjustable AR-15 or M4 buttstock into a fixed stock configuration. Engineered primarily for state compliance in jurisdictions that restrict collapsible or adjustable stocks, the CRSL immovably locks the adjustable buttstock to the buffer tube so the rifle presents as a fixed-stock configuration.

The unit is machined from billet 7075-T6 aluminum and finished in black for a tough, lightweight install that does not permanently modify the host firearm. Two Allen wrenches are included with the Stock Lock for straightforward installation, and because the install is reversible, the part can be uninstalled when the owner moves or transfers the rifle out of state.

Drop-in compatible with the standard AR-15/M4 platform, the CRSL gives shooters a clean, removable answer for feature-restricted builds without having to swap the entire buttstock assembly or alter the rifle's original components.