Not impressed. would not reccomend. - Guntec USA AR-15 Extreme Duty Wide Castle Nut For Car/M4 Buffer Tube

I purchased this for use with a KAK buffer tube and it did not fit at all! The nut threaded on but, not nearly far enough for the buffer tube to catch the detent.
I wound up using this for another project with a standard milspec buffer tube. It did fit and I felt confident that it would not back off but, the collapsable stock will to go to the shortest length of pull (milspec or Magpul), the tips of the nut scratched the finish of the buffer tube, and neither of my armorers wrenches fit properly. Again, I don’t think it will come loose but, I won’t be purchasing another nor recommending this product to anyone for a future build. I gave it 3 stars because it does appear to hold properly (range time will tell) and the threads were good but, it’s not really worth the trouble. A standard castle nut will suffice and costs less anyway.