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Short barrels can actually be more accurate than longer barrels to a point. The BB needs to accelerate completely before leaving the barrel. This allows the BB to reach its maximum velocity in the shortest distance therefore there is less alienation from the hop-up due to contact with the barrel. The alienation of off-axis spin is more pronounced with tighter barrels of longer lengths, and even more so if the ID of the barrel is not consistent. I'm not saying everybody should be going around building MP5K DMRs, as the BB wil not have reached the maximum possible velocity required of a successful DMR. That is why PDI barrels of larger diameter will be more accurate then one of it's tighter diameter relatives. How ever, the ideal length is right around the 450mm length as I and others have found.
 
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