I have a full auto SP1 conversion and I have heard that sometimes the holes in the lower egg out.
I'm curious if those KNS pin protector kits are any good or do anything.
I started a thread on getting a 9mm upper, and nobody even mentioned the KNS kit, which is kind of telling, because supposedly 9mm uppers chew up lowers.
Considering how valuable the FA SP1 is, I'm wondering what can be done to harden it against damage.
So I guess the questions are:
1. What kind of damage is done to ARs by shooting them,
and
2. What is done to prevent it?
I never really did any mods on my ARs before, so I'm kind of a newbie. I'm actually kind of surprised by how little knowledge I managed to pick up on the subject over the years.