The ROOK Tactical Smooth Operator Safety Plunger for GLOCK .45 ONLY  is machined from 17-4PH Stainless Steel and is designed to smooth out and lighten the trigger take-up thanks to its finely machined surface. 
 
DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.