Stocks
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The stock sets your length of pull and cheek weld. Most AR-15 stocks are adjustable (collapsible): they slide on a carbine buffer tube and adjust for body armor, winter clothing or a smaller shooter. Fixed stocks use the longer rifle buffer system, and precision stocks add an adjustable cheek riser.
Make sure the stock fits your buffer tube: mil-spec and commercial tubes have slightly different diameters, and a stock kit that includes the tube takes the guesswork out. Compare stocks across stores and add one to your build to keep the whole lower in one place.
Read our guide: How to Build an AR-15: Parts List, Tools & Steps
Stocks: common questions
Mil-spec or commercial buffer tube: which stock fits?
Mil-spec tubes are slightly thinner (about 1.148 inches) than commercial tubes (about 1.168 inches), and most aftermarket stocks are made for mil-spec. Check the stock's listing against your tube.
Can I put a stock on an AR pistol?
Not without ATF approval: a shoulder stock on a firearm with a barrel under 16 inches makes it a short-barreled rifle. Pistols use a brace or a bare buffer tube; the rules for braces have changed several times, so check current guidance.
Does a fixed stock need a different buffer?
Yes. Fixed A2-style stocks use a rifle-length buffer tube, buffer and spring; collapsible stocks use the carbine system.