I have a AR15 carbine that I bult about 20 years ago. Today I was swapping out an old A1 upper for a flattop upper (BTW, using an upper receiver vise), and I noticed that I could wiggle the barrel back and forth in the slot where the barrel extension pin goes in. So I removed the barrel and I was able to pull the barrel extension pin out with my fingers! I put in back in, tapped it ldown, but I noticed after I tightened up the barrel that the feed ramps appear to be slightly off center. So I removed the barrel and noticed that the pin was loose again.
So, can that barrel extension pin be replaced with a new one, or should I be looking for a new barrel, or what is going on? I'm somewhat freaking out, since this is my SHTF carbine.
So, can that barrel extension pin be replaced with a new one, or should I be looking for a new barrel, or what is going on? I'm somewhat freaking out, since this is my SHTF carbine.