There are several different shoulder holsters that can be
purchased for concealed weapons. The most popular is from Galco and
is available for men and women. Blackhawk makes a custom molded
holster specifically for the lower shoulder area.
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There are a number of retailers where one can purchase a leather
shoulder holster including Cabela's, eBay, Etsy, Cochise Leather,
JPB Holsters and Kirkpatrick Leather Company.
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Get a Copy of Shotgun News at the Bookstore. One of the holster
adds sometimes has Mauser Broomhandle stuff.