Superior Support & Better Spring Alignment Full-length, hardened steel guide rods help prevent spring bind and improves cycling. Lets you keep your factory, captive, recoil assembly intact and use Wolff recoil springs. Machined from solid steel, polished, then hardened. “GLOCK” is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or Glock Ges.m.b.H. Brownells is an independent dealer of parts and accessories for Glock® pistols, and is not affiliated with or endorsed by Glock, Inc. or Glock Ges.m.b.H. The use of Glock on this page is merely to advertise the sale of Glock parts or components. As indicated in the product descriptions, not all parts and accessories on this site are official Glock products. Big Book Catalog, Issue:68, Page:224 Law Enforcement / Police Store, Issue:03, Page:023