The blank firing barrel can be machined from a solid block of metal such as stainless steel so that the barrel end is {HEAD ~ a contiguous portion} of {TAIL ~ the original solid metal block} 
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The blank firing barrel can be machined from a solid block of metal such as stainless steel so that the barrel end is { HEAD ~ a contiguous portion } of { TAIL ~ the original solid metal block }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL