Absolutely fantastic – just don't forget the loctite! - CMMG AR-15 ZEROED Gunbuilder's Lower Parts Kit

I really, really do like this lower parts kit from CMMG. As someone who's built a few lowers, this is probably the most straightforward and well-organized kit I've ever used. Everything you need is right there, sorted nicely, and the quality of all the small parts is excellent. The included trigger is actually really decent for a mil-spec style one—nice and crisp.

The best part is the confidence it gives you. Knowing that everything is from a single, reputable manufacturer and is designed to work together perfectly takes the guesswork out of building a lower.

Now, for my one highly important suggestion: I would highly suggest that you lock tight all the parts that have to screw in. Specifically, the bolt catch roll pin and the trigger guard screws are the main ones. It's just cheap insurance to make sure nothing works its way loose after hundreds of rounds. I did it on my build and it's rock solid.

If you're building an AR and want to save yourself the headache of sourcing fifty different small parts, this kit is 100% the way to go. Just have your blue Loctite handy and you'll have a perfect, reliable lower. Fantastic product