• Can be used w/ factory or flat wound springs
• Rigid steel body improves lockup w/o "rod flex"
• Hex screw allows user to choose spring weights
• Will not chip or crack like plastic guiderods
• Blue loctite recommended on hex screw threads
• Can be used w/ gen 4 glocks w/ conversion insert
• GR-1722 fits G17/17L/22/24/31/34/35/37 pistols
• GR-1923 fits G19/23/32/38 pistols
• GR-2021 fitsG20/21/21SF pistols

May also need Recoil Conversion Insert.