Best buffer tube - POF USA Enhanced Anti-Tilt Buffer Tube for AR15 .223

I use these for all of my builds. They are expertly machined to completely cover the threads on the inside of the receiver, and fully support the carrier assembly in travel, while still allowing the separation of the upper and lower. It has drain holes in the end and in the stock adjustment pockets. It is beautifully finished with a subdued, black logo underneath,not an ugly white or other color logo like some manufacturers. If you are looking for the absolute best M4 style receiver extension/buffer tube, this is it.