Upgrading the adjustable stock on an AR-15 is one of the easiest upgrades you can do. Before you buy a new stock is it important to know what kind of buffer tube your AR-15 has. There are two types of Buffer tubes commonly used on AR-15s; Mil-Spec and Commercial. Stocks are made for each buffer tube type but they are not interchangeable. If you do not know what kind of tube you have click here to find out how to determine which kind of tube you have. Once you know what kind of tube you have you can order a stock for the correct buffer tube. This guide will show you how to change the stock.
Step 1 - Extend the stock as far out as it will go and pull down on the adjustment latch and slide the stock off of the buffer tube:
Step 2 - Slide the new stock onto the buffer tube. It should only go on a little way. Then pull down on the adjustment latch and slide the stock onto the buffer tube. Release the latch once the stock is on the buffer tube.