This is a lefever that i own it's a HE grade, the lever does not close completely when the gun is locked up. if the lever is manually placed in the center postiton it locks up tight but it does not spring back like my other doubles. it also appears to be missing a screw. I've posted pics and would like to know how to repair and if the missing screw can be repelace. i'd like to sell this and would also like to know a reasonable price to list for. thank you, scott