Great product at a great price - UTG Pro AR15 6-position Receiver Extension Tube, 6061-T6 Aluminum

You need look no farther for a good inexpensive buffer tube. Don't waste your money on "prestige" brands. This tube has an advantage over many others I have worked with. The tube is threaded about a 1/2" farther up the tube than many others. This is very helpful when you are installing the safety detent/spring and endplate because it allows you to get the castle nut out of the way. Since it has to go on the tube first, being able to move it farther up the tube makes what can be a tricky procedure for the novice much much easier. The Cerakote is very well done as well. I give it 5 stars all the way!