When I shot my built up Artillery, the top reciever(bbl. extension) had cracked, sent the upper to Tom Heller and he rebarrelled it to a new upper(thanks Tom), this was in 2000. I noticed the crack on the bottom where the 2 extensions.meet the breech. This was on the ejector side. Also had broken the breech block on one upper rear side right where the cut out for the part that goes against the firing pin spring, Thanks to Tom H. I was able to get that part too. Check the bbl. extensions after shooting, preferably after cleaning.
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