There is a myth that Avengers, or the IWB versions, need metal inside the mouth accent to hold the mouth open. The use of metal there by some makers is simply a holdover from when metal was used in competition holsters; it is neither necessary nor even desirable. The metal can be crushed when going prone with an empty holster and wearing forward of 3:00. Instead, it is the tension of the two layers, which is exaggerated by the gluing and the stitching of the layers, that is created when the assembly is folded that holds the mouth open. For awhile I used a thin layer of polycarbonate there 'just because' (it flexes but can't break in that construction) but discarded it as 'no value added'.

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Red Nichols The Holstorian