Is your extreme spread increasing? Has your standard deviation gotten worse? Before adjusting your regulator, hammer spring, transfer port, valve, or other tuning settings, inspect your breech seal.
A worn, cut, flattened, or damaged breech O-ring can allow air to escape around the pellet, resulting in inconsistent velocities and reduced accuracy.
Many shooters spend time chasing tuning issues when the problem is simply a worn breech seal.
A worn breech seal is only one possible cause of poor consistency. Extreme spread and standard deviation can also be affected by:
Replacing the breech seal may help restore consistency if the existing seal is worn, damaged, cut, flattened, or missing, but results will vary depending on the overall condition and tune of the air rifle.
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AFTERMARKET PART - NOT OEM. Brand names and model numbers are used solely to identify compatibility. This product is not manufactured by, affiliated with, or endorsed by the original equipment manufacturer.