I won't be offended if anyone contradicts me, but I'm dubious about "drop in" unless it's maybe from a topline custom guy. Does it have a fitted bushing included? Already "perfect" as to throat and polish? A lot of the other stuff mentioned in Halleck, like the slight "breaking" of the edges of the lugs, or links of various center-to-center options?
Seems to me some guys advertise "Match" like others advertise "Tactical"...