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GB Chainsaw Bars: Jack's is your place! We have the GB chainsaw bars you need, with fast shipping and great prices! Select the type of guide bar you need below. Sprocket Nose Bars:Quicker chain movement around the nose reduces heat and maintains cutting power. Replaceable Sprocket Nose: Replace only the nose of the bar if damaged, or if using a different chain pitch. Solid Nose Bars:High strength, robust bar designed for professionals working in rugged, dirty environments.