This product was designed about two years ago. One afternoon in a duck blind with thick gloves I couldn’t find the little button on the side of the receiver to get the bolt closed. With the gloves it was very difficult to find the little release button and it was difficult to close when I did find it. The lever was designed and manufactured. The lever is made from Stainless Steel and screwed into the modified Beretta button with a stainless screw. Now your pinky finger or any part of your hand can close the bolt with minimal effort. So far we have never broken a unit and they have been put through several torture tests to prove their reliability. Easy to install and they come packaged with all the tools required including color photo instructions to make this about a 5 minute job to convert. The closer will only fit the following models of the Beretta Semi Autos: 303, 390, 391, Teknys, (12 & 20ga.), & the new 391 Extrema.