Great for the money - VISM AR15 Lower Receiver Vice Block

Compared to the exponentially more expensive competitors, this buffer tube alignment tool is equally as effective and substantially greater value. It does the job for so much less money. Build quality is exceptional. Held my lower and buffer tube in perfect alignment while I torqued the castle nut and staked it in place. I spent an hour the next afternoon taking apart all of my lowers and realigning all of my buffer tubes. I had no idea how crooked they were until I got this tool. WORTH. EVERY. PENNY.