By A Mystery Man Writer
BRASS 12 gauge dummy rounds / snap-caps / fake bullets. Looks like the ones used by the US Army during WWI and World War Two in the Model 1897 Trenchguns.
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ROiL TACTICAL 556/.223 Dummy Round - Package of 5 – ROiL Tactical
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To Dummy, or not to Dummy -The Firearm Blog
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Strike Industries Aluminum Dummy Round 12 Gauge, round 12
Pachmayr® Snap Caps for Shotgun, Pistol & Revolver.