Product Review
This National Match Spring Guide improves the consistency and smooth motion of the operating rod which helps reduce wear and increase rifle accuracy over the standard stamped GI guide. The Sadlak spring guides are hardened to the original USGI spec. 40 - 44Rc. Each of the NM spring guides is hand inspected for straightness within .002 max. over the length of the guide.
The result of this attention to detail is a spring guide which weighs 2.3 ounces, has the straightness to properly align the spring without binding, and the hardness to stand up to extended use without appreciable wear.
Finished with a corrosive resistant Mil. Spec. manganese phosphate (Parkerized). What makes this NM Spring Guide unique and more accurate is the precision alignment of the magazine catch to the guide shaft.