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