AR stock stopper

thingiverse

This is a simple insert to limit the movement of a standard adjustable AR-15 stock. It goes in the bottom of the buffer tube. For example, I use one so that when I extend the stock, it automatically stops at my preferred length. You can also use 2 (or more) to completely stop the stock from adjusting, for some less friendly states. This fits my carbine, but you may need to scale it up or down by a few percent to get a perfect fit in yours. This was inspired by a similar item from Strike Industries. You can buy one from them for $6, or print one for a few pennies.