The correct chain for this item would be the Stihl 63 PMM3.
STIHL Farm Boss Gas-Powered Chainsaw, 20in. Bar, 50.2cc, 0.325in. Chain Pitch, Model# MS 271

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- 3.49 HP gas-powered 50.2cc engine
- 20in. bar with Oilomatic® chain with 0.325in. RM 3 chain pitch
- Anti-vibration system minimizes vibration levels for comfortable handheld use and reduced operator fatigue
- Pre-separation air filtration system separates air via centrifugal force as it's first drawn into the engine, ejecting the heavier dirt particles before being routed to the air filter, resulting in less frequent cleaning and maintenance
- Environmentally conscious Reduced-Emission Engine Technology produces zero to low exhaust emissions, performing cleaner than EPA and/or CARB exhaust emission standards
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