Jager Products Glock Generation 3 Guide Rods - one piece rod CNC machined from hardened, black oxide coated steel or self lubricating polymer. Available in captured or uncaptured models for G17/22, G19/23, G20/21/21SF, and G34/35 guns. The G34/35 full length uncaptured rod is only compatible with the larger diameter Wolff springs. Use the Wolff #14 spring with the Gen 3 full length 34/35 rod. The self-lubricating polymer captured unit is IDPA SSP and ESP division legal and is made for the Glock 17/22 but is also the rod you need to stay IDPA legal with a Glock 34 and 35. The polymer 17/22 rod works fine in Glock 34 and 35 model guns.. Now you can have the best features of the light weight stock assembly and still be able to easily swap recoil springs. Note: the G20/21 rods work with the Glock 21SF.