Oh boy, yes! I carried an Ithaca 13" model 37 with open sights when in the NYPD Robbery Squad (Bronx Central Robbery. We went after heavily armed robbery teams, or so they told me...). That "sling" attached to the pump handle is to keep an overly enthusiastic officer from blowing his fingers/hand off should they become a tad too excited.
I carried slugs in the one I turned out with (in order to reach out and touch someone, should that have been necessary. Four slugs in the magazine, one stuck in the "sling" thingy.
Understand this, there is no advantage in having a shotgun without a butt-stock. Unless you can show me how you can reduce the distance from your elbow to your hand. Love that check-weld!
Oh, one final thing. The guy in the photo was much younger young me. Around 1980 or so.
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We used the Ithaca model 37 with either 20" or 13" barrels, both with open sights and the 20" had a sling (what if you get into a tussle while holding you shotgun, where you gonna put the darn thing?!?) and the Ruger Mini-14 in .223. All good guns.
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Rich