Quote Originally Posted by onmilo View Post
Staking is OK but not absolutely necessary if everything is installed properly. It is the Military way of keeping people from taking things apart that they shouldn't be.
This is absolutely not true. I have personally had a properly torqued down castle nut loosen from my M16 after only 4 - 5 mags on auto. This happened to me more than once. The buffer tube WILL transfer some vibrational forces to the castle nut, which can cause it to loosen. This has happened to me with both a standard Colt M4 stock and with a Knights receiver endplate singlepoint. Staking helps prevent this.