Possibly sleeved, Yes, Mono-Blocked, NO. Not that is unless a whole new mono-block set of barrels were built as Parker's did not come from the factory with a mono-block. Simply cutting the forward portion of a set of dovetail jointed barrels does not a mono-block make. The term Mono means the entire rear portion; barrel breeches, lugs etc were machined from "ONE" (mono) block of steel.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra