If I'm not mistaken, that's the location of the "mij" roll-stamp typical of guns with a BTFE. That said, the BTFE gun I have has the mij roll-stamp in the typical SFE location so..
I contacted the seller about this gun just about the time it became available..he didn't realize the engraving differences and he didn't have any info indicating the gun was in fact, a true prototype. Here's the left and, underside of the gun. If I recall correctly, it's a "P" gun.
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