Buy a few.
Along with every other wear item. A complete BCG (bolt carrier group) as a spare is a smart thing. When I have a part go down, I go to the drawer and grab another. In light of the times we live in, I don't want to be caught short handed.
Same applies to Glock handguns.
Go to the parts bin and grab parts and replace. I am not going to rely on being able to get something in the future, as that may not be a possibility.
That is smart. I was thinking about getting a complete BCG and even posted about it in another thread, but then changed my mind forgetting completely about the retainer pin. Now having been caught short I'm going to go back to the original plan.
I've got spare parts for about every firearm I own except 2. The one parts are pretty none existent and I don't shoot it much any more, but the other, the AR15 I'm going to remedy.
I admit the AR has not been my favorite firearm and I've shot mine very little. I much prefer bolt rifles, but as Mackay says, in the light of the times we live in, the AR has walked back to the forefront.
Thanks for all the help, this has become a real learning curve.