When someone purchases a barreled action they must be sure to properly fit the magazine. The feed window of rimfire is very small and care must be taken to have everything lined up perfectly. There is a wide range of variations in the magwell of various chassis and bottom metals and each system has to be tuned in its own way. We do this at the shop but when someone purchases a barreled action the fitting is on the end user. Call the shop if you have any issues tuning in your specific chassis or bottom metal.