David,
The horizontal groove in the top front of the barrel extension is a relief cut to accommodate the rear sight leaf's lowest position on Artillery Lugers. You'll have seen it on pistols produced by Erfurt, which made the cut on all their pistols after a certain point finally assembled as non-Artilleries. You'll also find it on DWM pistols that were re-barreled with anything other than an Artillery barrel with the rear tangent sight, usually P-08s created to bring the pistols into compliance with Versailles Treaty regulations for barrel length.
Yet Another David
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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