What do I need?

[montana]

First my sympathy for all northern Calif. residents. To build a Grendel all you need is the Grendel bolt,barrel and magazine. Make sure your bolt matches the barrel as some manufacturers use different bolt depths and mixing different manufactures bolts and barrels could cause head space and functioning problems .If you are building a carbine you probably should use a H-1 buffer. The barrel nut should be torqued to a min of 65 lbs because of the Grendels recoil. Everything else should be standard for any 5.56 build. Check out the other threads on this forum if you need more advice and opinions. I'm not sure what legal requirements are needed for Calif residents when building a semi auto. I think you need a push pin mag release button on your rifle so make sure you know the laws of your state before you start your build. DS arms had bcg and other parts when I last looked. Bravo Company has parts from day to day and I can recommend them for being a quality manufacturer so I would check them out daily .