BarrelBlok 357 universally fits into any semi-automatic pistol chambered in .357 Sig. Each BarrelBlok 357 comes with one (1) BarrelBlok, three (3) MagBlok magazine inserts and an instruction booklet. Your firearm does NOT have to be disassembled to use BarrelBlok. Simply insert BarrelBlok to train, and remove it to return your firearm to its ready state. BarrelBlok is SAFE, REALISTIC, TRAINING!
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