The Blish Lock did perform a function in slowing the action down a bit, but was really unecessary for the safe or reliable operation of the TSMG. One realizes how much the Blish does influence functioning when you try to Blank a 21 or 28. They will simply not run with a Blish as designed installed. You have to lop off both the "ears", which ride in the channels completely off the Blish Lock, keeping the central "H" piece intact for it to mate the bolt and actuating assembly in order for a 21 or 28 to run with Blanks.
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