Tisas 1911 Duty B9R Double Stack, 9mm, 5" Barrel, 2- 17rd Magazines, Optics Ready - $623.58 (add to cart price) Tisas 1911 Duty DS pistol is a modernized version of the venerable 1911 pistol. The pistol features a hammer forged slide with front and rear slide serrations; double stack magazines;