The ROOK Tactical OEM Style Safety Plunger for GLOCK 9mm/.40/.357 and 10mm  slides and is machined from 17-4PH Stainless Steel and is designed to give that stock feeling with a slightly reduced grittiness and overall smoother trigger pull thanks to the fine machining of the surfaces. 
 
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.