Hk91 200547 Rod, Recoil Spring Guide, Description: Heckler And Koch G3/HK91 Recoil Spring Guide Rod. Crafted from steel, this factory original part from HK is made in Germany and designed for H&K G3 and HK91 rifle models chambered in 7.62x51mm / .308 Win. The guide rod is part of the recoil guide assembly and provides a solid path for the recoil spring to travel upon as it is compressed. Heckler & Koch is world renowned for their high quality firearms and parts. You know when you buy an H&K part or accessory, that you are getting the highest quality materials and assembly available.