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Sig Classic Pistol Preventative Maintenance Guide

Preventative maintenance is important for any mechanical device including Firearms. Our Sig Classic Pistol Preventative Maintenance Guide will help your Sig Classic Pistol performing as the manufacturer intended. 

Be sure the firearm has been safely unloaded. Visually and physically check that the weapon is unloaded and all ammunition has been removed from the work area before performing any type of maintenance on a firearm. On pistols, I like to use a zip-tie to verify that there is no round in the chamber or any foreign object lodged in the barrel. On rifles, I like to use a cleaning rod with no jag on it to verify that there is no round in the chamber or any foreign object lodged in the barrel. 

In order to keep your Sig Classic Pistol operating at its maximum, there are several steps that should be completed. These include:

Properly clean, lubricate and preserve the firearm each time it is fired or exposed to environmental conditions such as dirt, sand, and water. Be careful to not over lubricate any part as this will attract dirt and residue and cause feeding and extraction problems.  


Safely inspect, troubleshoot and perform any routine maintenance on a regular schedule.


Safely perform a “function check” to determine operational readiness. If applicable, understand the agency’s policy on the maintenance, repair, or replacement of unserviceable weapons.


Understand any liability issues related to improper maintenance, unauthorized repair, or unauthorized modifications to the firearm system.


Use the appropriate tools, lubricants, and solvents in the recommended manner when performing firearms maintenance.



Use a nylon brush with solvent or similar material to dissolve and remove any firing residue in or on the frame. Pay particular attention to the magazine well, rails, raceways, and surfaces that interlock with the barrel. 
Once the frame is clean, it should be lubricated by saturating a cleaning patch with a lubricant and wiping all exposed metal surfaces, give emphasis to lubricating the frame rails and raceways as well as the surfaces that interlock with the barrel. Wipe exterior of the frame with a clean patch to remove any excess lubrication



Thoroughly clean the barrel using a bore brush of the correct diameter for the barrel’s caliber using cleaning solvent. Use a cleaning rod long enough to reach all the way through the bore. The brush should pass completely through the barrel at least ten times in an in and out manner. You should start your cleaning from the chamber end. 
After cleaning the barrel use a dry patch in either a jag or slotted patch holder to wipe out all residue from the barrel. Five special attention to the feed ramp and chamber mouth areas. Once dry patches are passing through the barrel clean, finish by pushing a barrel with a lubricant or preservative. Be careful to not over lubricate the barrel as it may contribute to a malfunction. 


Recoil spring and guide

The recoil springs and guide may be cleaned and lubricated either separated or together. I prefer to do them separate as I feel that I can make sure that the guide is clean of any residue.
Clean the parts with appropriate solvent and then wipe down all exposed surfaces with a lubricant/preservative. 



Clean the interior and exterior of the slide with a nylon brush and an appropriate lubricant or preservative to dissolve and remove all residue. The slide rails or raceways and locking surface should be thoroughly cleaned as well as the breech face. Special attention should be given to cleaning the extractor as foreign material or residue can cause extraction problems. After cleaning, wipe all exposed surfaces with a lubricant or preservative making sure to not over lubricate. 



The magazine can be cleaned with a nylon brush or lint-free cloth after disassembly. Wipe all metal surfaces with a lubricant or preservative making sure to not over lubricate. 


Function check

A function check should be completed any time the pistol is cleaned or reassembled. Check out our Sig Classic Pistol Function Checks post for information on how to complete this.