The Epitome For The Gunsmith
Super-hard, pure polycrystalline cuts tool steel, hardened steel and tungsten carbide. Perfect for final honing. These stones cannot be classified in terms of "grit" but only in terms of the average grain size. The average grain size of types "fine" and "medium" is about 10µ (microns).
Big Book Catalog, Issue:71, Page:443
SPECS: No. 221 Flat - 4" (10.2cm) x 5/16" (8mm) x 1/4" (6.3mm). No. 291 Knife - 4" (10.2cm) x 5/8" (15.9mm) x 1/8" (3.2mm).
Drop-In Upgrade Parts Improve Trigger Pull For Competition Or Carry
Drop-in replacements for factory components enhance reliability and optimize the performance of your M&P for different applications. Hardened stainless steel striker safety plunger has different geometry and dimensions from the factory part to help deliver an exceptionally smooth takeup before the trigger bar engages the sear cam. Minimizes drag on the trigger bar as it transitions to the rest point, and gives a more clearly detectable reset. Mirror polished surface for minimal drag. Includes a reduced-power plunger spring to maintain safety integrity while reducing drag. Also includes a tool to aid in fast, easy installation.
Big Book Catalog, Issue:71, Page:236
SPECS: Heat-treated 17-4 stainless steel, mirror-polished surface. Fits all M&P pistols.