Evolution Gun Works 2 Piece Guide Rod 1911 6in .326in Stainless Steel. 1"Guide Rod Diameter:.326"Recoil Spring Type:Round (Not Included)This kit does not include recoil springs but they can be purchased separately.The head of the guide rod has smooth beveled edges to make for a seamless look.It is necessary to remove the front half of the guide rod to disassemble the gun.Check for fit in 3 areas:(1) Barrel feet should not contact head(2) Where guide rod rests against frame(3) Back surface of slide/dustcover is flat and even.This is designed for long slide 1911 pistols with 6" barrels.Machined from solid barstock here in the USA.This is a 2-pc guide rod. Disassembly of a long slide gun would not be possible with a 1-pc. Specifications for Evolution Gun Works 2 Piece Guide Rod 1911: Manufacturer: Evolution Gun Works Finish: Stainless Fabric/Material: Steel Gun Make: 1911 Platform Gun Model: 1911 Package Contents: Evolution Gun Works 2 Piece Guide Rod 1911 What firearm models does the manufacturer say Evolution Gun Works 2 Piece Guide Rod 1911 is compatible with? The manufacturer says that Evolution Gun Works 2 Piece Guide Rod 1911 is compatible with 1911Evolution Gun Works 10420: 2-Pieces 6 in Guide Rod 1911 5.1 in .326 in Steel Stainless