Best upgrade out there - Magpul Industries B.A.D. Lever

This item fixes arguably the worst thing, but certainly the most awkward thing, about the AR-15 platform. It attaches to the bolt catch and allows for bolt catch operation with your trigger finger. This eliminates the need to bring in a second hand to operate the catch. The item itself is covered in a nice matte black finish and is quite durable. I’ve never had to adjust or retighten a screw. This is an automatic add on for any of my builds.