GLOCK PLASTIC GUIDE ROD ASSEMBLY - GLOCK 19, 23, 32. PLASTIC GUIDE ROD ASSEMBLIES ARE A COMPLETE DROP-IN UNIT. FEATURES: •Solid one-piece Plastic guide rod. •Precision machined to fit. •The recoil spring is manufactured of certified materials, heat treated for longer life, shot peened for stress relief and finally calibrated to Glock factory specifications 17 lbs. for full-size (17/22/31) and 18 lbs. for compacts (19/23/32). •These combined features make this Guide Rod Assembly the most durable, longest lasting system available today.