FP guide rods are manufactured from stainless steel and have a black nitride finish. I have found black nitride to be extremely durable and corrosion resistant.
These are a great replacement for the factory plastic guide rod in the Gen 1-3 Glocks and allow the use of different recoil springs to tune your gun to your ammo for smoother recoil impulse and better sight track.
Available for Gen 1-4 Glock 17,22,34,35 (these also fit the 4.25 and 5" M&P 9mm and .40 1.0 and 2.0 - Will not fit M&P Compact)
Also available for Gen 1-4 Glock 19 and 23
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Quality product. Very quick shipping. What more can you ask for.
This guide rod is great you get to tune your gun with whatever weight spring you want without having to fumble around with an un-captured guide rod spring. Don't forget to lock tight the screw cause it will definitely back out. Overall great product!