A while back I picked up a used old Colt AR15 upper. After I received it, when I first cleaned it I considered replacing the gas rings and extractor spring due to the clear fact that this upper had been used a good deal. I talked to Shawn about this, and he suggested since it wasn’t going to be my go to gun, leaving it and seeing what happens.
Well a broken gas ring happened. The upper functioned fine, and I have no idea where the broken section of gas ring went, but when I went to clean the upper yesterday I found one of the rings had failed. So all the gas rings got replaced and a new extractor spring was dropped in.
So while this parts failure didn’t stop the gun from running, it is a good example of why we need to do preventive maintenance on anything our lives depend on.