This is a drop leg adapter for the USGI M12 holster. The adapter allows the user to mount their holsters lower and out of the way of other gear.
Adjustable Drop Leg Holster - Left Handed
MOLLE II Holster / Leg Extender : Gun Holsters
Cordura Shoulder Holster
The Modular Holster Adapter: Breaking the lineage of failure
USGI M12 Holster Drop Leg Attachment [Genuine Army Issue]
Eagle Industries UH-92F ACU Molle Universal Drop Leg Holster
Us Military Holster
M-12 Universal Holster for M9 9mm Handgun [Genuine Army Issue]
Adjustable Drop Leg Holster - Left Handed
The Modular Holster Adapter: Breaking the lineage of failure
The Modular Holster Adapter: Breaking the lineage of failure
USGI M12 holsters CarolinaFirearmsForum
Handgun holster - Wikipedia
M-12 pistol holster, Part #9388057, NSN 1095-01-194-3343, for a Beretta M9. USGI Manufacturer: Hill Country Leather. Fits Beretta M9 series 9mm.
USGI M12 Woodland Camo Beretta M9 Holster - Hill Country Leather - PN 9388057