Field stripping is the term for disassembling a gun into its major components or assemblies. You don't completely disassemble it, but you break it down enough that you can clean and lubricate it.
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How to Field Strip and Clean a MA1 Airsoft Pistol: 10 Steps
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While I will not go into detail on the field stripping of each pistol, I will rank them for ease of disassembly and maintenance, with a few comments.
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These are important and simple instructions to field strip, clean, and oil a Ma1 type airsoft pistol.
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Up Close and Personal: Part 8: Disassembly and Maintenance
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Start by ejecting the magazine not shown and locking the slide back. Keep the gun pointed in a safe direction with your finger off the trigger during this entire operation.