Aliasing mp_40 → mp_40_(gun)
Link to alias

Reason:

More tag consolidation, with clearer labeling about what the string of numbers and letters describes.

(also mp_40_smg should be mass-retagged to mp_40_(gun), because the latter reads better)

Related aliases:

mp-40 -> mp_40_(gun)
mp40 -> mp_40_(gun)

Related implications:

mp_40_(gun) -> submachine_gun (and therefore chain-implicate mp_40_(gun) -> submachine_gun -> gun)

EDIT: The tag alias mp_40 -> mp_40_(gun) (forum #279231) has been rejected by @bitWolfy.