This spring is 1-5/8" long and .043 wire diameter. It's the strongest striker spring you can use for 13XX and 22XX models without damaging the gun. It will boost the power of 2240, 2250, 2260, Crosman Custom Shop, 1377, 1322, PC77 and 2289G Backpacker. The power adjusters I have listed for these models are highly recommended. They allow you to fine-tune spring tension for the best balance of performance, accuracy and efficiency. PCP and HPA guns that operate on pressures of 2600-3200 PSI will work better with the Magnum Striker Spring I have listed.
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