The B14r magazine extension will give you a total 12 rounds. They also add weight and a larger gripping surface to the magazine.
|Dimensions||9 × 9 × 5 cm|
BLACK, Olive Drab Green, Orange
Unit was made well, should be supplied with the correct length spring. Also you should not have to grind down the follower to get 12 rounds in. I paid you to do the engineering work? otherwise great product.
The only thing I would ask is you add the correct length mag spring. shell tension is very important in the 22lr game. Thanks Joe