So everyone knows that the AR-15 is a respectable firearm and with that said I have seen and I have experience a failure or two. With that in mind I wanted to see what you guys think of carrying backup parts. For example I have a extra complete bolt and firing pin stowed in the grip!
This grip is a BCM mod3. The retention on the trap door is really tight and has a rubber liner. There is a small piece of foam to stop them from rattling. Both the pin and bolt have been treated with frog lube.
Magpul also has an interesting offering with a base plate for the bolt and firing pin. They work ok in my opinion.