Great mil-spec buffer tube - Franklin Armory A2 Rifle Receiver Extension/Buffer Tube

Great black finish. Very solid Tube. Dry inside so spring makes loud sound. Maybe some clp would help. The reason I gave it 4 stars is because I had to really torqued it all the way on a PSA lower. I am not sure which threads are a bit oversize if the lower or the tube but man, that thing was a heck to put it in place. I had to use a heat gun to heat the receiver threats so it can expand a little bit in order for me to keep threading it all the way. The good thing is that This tube is not going anywhere loose once is torqued all the way. I am very happy with this product.