Basic part that works - Luth-AR AR Bolt Catch

Why 5 stars? Because it's cheap, in spec, and works. There's really not much else to say about the thing. Order this with its springs and use it in your next build unless you're going the PDQ lever route. Also, if you see all these reviews next to mine talking about the BAD lever. Don't use one of those things, they're a safety hazard and just a worse PDQ lever.