This is the unique gallery style outer magazine tube Winchester 1890, 1906 pump .22. It will also fit the model 61,62 and 62A. This is .22 cal Short, Long and Long Rifle rounds (will not work WRF rounds) Many of the Winchester 90 and 06s were used in the early shooting galleries. They were fitted with this outter mag tube that had a triangular loading port. It made loading faster than with the standard tube. (All replacement outter mag tubes are designed so you dont have to use the magazine friction spring)