Cleaning a Smith & Wesson Sigma is necessary to keep it in working shape.
When you own and regularly use a gun, cleaning it is a necessary part of the ownership responsibilities. The Smith & Wesson Sigma is a 9 mm semi-automatic firearm with a magazine capable of holding 10 rounds of ammunition. Since the Sigma is a semi-automatic, there are elements that will need to be cleaned that are not found on a simple revolver. A partial disassembly is all that is required for basic cleaning; however, it is recommended that you completely disassemble the firearm for more thorough cleanings.
Instructions
1. Press gently on the button located on the bottom of the gun grip to release the magazine. Remove the magazine from the Sigma and set it aside. Pull back on the slide and check the chamber for a live round inside.
2. Point the Sigma in a safe direction and gently squeeze the trigger. This will release the firing pin from a cocked position.
3. Pull back on the slide about a quarter-inch and press the slide release notches located on the left and right side just under the slide. Lift the slide up and away from the grip assembly and set the two pieces apart from each other.
4. Remove the large spring located in the slide and set it aside. Remove the barrel. For a standard cleaning, this would be as far as you need go. Just apply a drop of oil to the spring and scrub out the barrel with a wire brush, clean the inside of the slide with a lint cloth and reassemble the Sigma. For a more detailed cleaning of all parts, you will need to continue.
5. Carefully remove the end cap located at the rear of the slide assembly. Do not force it, as damaging the end cap can have serious consequences for the safety and effectiveness of your Sigma. The end cap slides down and away from the slide assembly after being gently pried downward. There are some small springs inside here, so use caution so you don't lose them.
6. Slide the firing pin assembly out of the opening where the end cap was located and set it aside. The pin is a small piece that can be bent if you try to force the pin assembly out.
7. Remove the extractor spring, which is the small spring located immediately underneath the firing pin assembly. Set this spring aside and remove the extractor piece.
8. Remove the striker spring from behind where the extractor was located. The striker spring allows for an easier pull of the trigger. This is a very small spring, so use caution in removing so you don't lose it.
9. Set the smallest parts aside in a plastic bag while you oil and clean the springs, the slide and clean the barrel of the Sigma. Reassemble the pieces in the order in which you removed them.
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