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