Originally Posted by
ASH556
Generally the consensus is that KNS pins are a waste of money, not needed, etc. However, I encountered something recently that made me think maybe they're not such a bad idea:
The shop/range I work at rents some full-auto guns. One of these is a Colt 635, which is basically an M16 in 9mm. Someone brought it off the range saying the trigger wouldn't work. Well, I took it back to the bench and opened it up to find that the hammer springs were broken. No surprise as these full-auto rentals see thousands of rounds a week, if not in a day. The gun is setup with a pair of KNS pins because it is prone to breaking hammer pins. Upon removing the hammer pin to replace the hammer spring, I found that, indeed, the hammer pin was broken, cracked right in half. However, due to the nature of the KNS containment of the FCG pins, the weapon still functioned until the hammer spring broke. Being that this is a rental gun, I did not bother to replace the pin and simply replaced the hammer spring and re-installed the two halves of the hammer pin and then the KNS retainers. I took the weapon into the range, performed a mag dump for function check and returned the weapon to rental service. This was three weeks ago and there have been no issues since.
So, I guess maybe KNS pins are good sometimes?
Any thoughts or notions to the contrary?