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Posted: 1/16/2014 8:09:33 AM EDT
I bought my ar from a friend who used an a1 stock and forearm to cut down on cost. the rest of the rifle was a2 configuration. I encountered a problem with the bolt hold back mechanism. it would only hold the bolt open occasionally. I could not understand the problem because it was so erratic. I finally took the spring and buffer tube out and saw that the old buffer tube had come apart. the plastic end piece had broke and had pieces scattered inside the buffer chamber. I called up armalite to order a new buffer tube and the guy thought i should replace the spring also,which i did. i guess the lesson is to try to always buy new and try to avoid used items even though the price is low.
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Wait a minute... do you mean the weighted piece that the is partially inside the spring? That is the buffer.
What people call the buffer tube (real name is receiver extension) is the aluminum tube that the stock is covering. I think that's what you're calling the buffer chamber. It sounds like the acton spring (or buffer spring as it's commonly, but again incorrectly called) was worn out and weak which allowed the buffer to keep hitting the back of the receiver extension. Was it also kind of mushed? It could also have just gotten brittle from age (or a bad one with something contaminating the polymer when it was made) or a chemical that was used for cleaning was not polymer safe and weakened the plastic. |
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