I have this barrel on my M17 Elite and it drastically improves the accuracy of not just FSR's but .68 cal paint as well. I never really used to buy into the idea of rifling having an impact on regular paint but I have noticed a slight increase in accuracy.
The biggest difference has been shooting FSR's through this barrel...wow. Yes. It works. The barrel is bored to specifically fit FSR's. If you plan on shooting First Strike rounds, this barrel is WELL worth the investment.
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