Sounds like you know then. The rest us up to you and how much you are willing to spend. AR-15 builds are good because parts are interchangeable between manufacturers. Lots of Youtube videos to point you in the right direction for assembly as well. Be warned if you're starting out, there's a number of gun smithing tools you'll want to acquire, from magpul wrenches to long hex wrenches.

Sounds like you know then. The rest us up to you and how much you are willing to spend. AR-15 builds are good because parts are interchangeable between manufacturers. Lots of Youtube videos to point you in the right direction for assembly as well. Be warned if you're starting out, there's a number of gun smithing tools you'll want to acquire, from magpul wrenches to expended hex wrenches.