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The pressure generated by hand-powered grease guns, for the most part, is dependent on the strength of the person operating it. “It takes a strong guy to produce 5,000 psi with a normal grease gun,” ...

The M3A1 “grease gun” was a simple, fully-automatic submachine gun manufactured out of stamped and welded steel rather than the forged steel as most firearms are made. The gun itself should probably ...