Don't forget the lube!
*Edit: Actually, at the time this video was shot, I didn't realize it, but the hammer I had in the gun was way out of spec. The auto sear wasn't engaging the hammer hook unless the hammer had enough inertia to fling down well beyond where it would normally go with just the bolt carrier pushing past it. It works now that I've replaced the hammer.
![](https://i.ytimg.com/vi/dV3BD3LXRu8/maxresdefault.jpg)