If you’re even a little bit mechanical, you can probably build your own AR, but don’t go it alone. Along with many of the basic parts you’ll need for your rifle, Brownells.com has a “Learn” section that provides a series of twominute videos that will make the process much easier. In addition to common household tools, you’ll need a couple of inexpensive specialty tools, also available from Brownells, including a buttstock tool, a lower-receiver vise block, and a barrel extension torque tool. While common AR-15 parts are easy to work because specs are standardized, AR-10 parts often are not. Consult the manufacturer or supplier to be sure that the parts you want will all play nicely together. That done, assembly can be completed in an evening.