try replacing the recoil spring... just a thought?Hello, i have a special weapons SW5A in 9mm that will not feed when i slap the charging handle because the bolt does not travel far enpugh back to pick up a round. If i manually pull the charging handle to its rear most position i can then get it to feed correctly, and it fires semi-auto just fine thereafter. What is going on here? Im using an '84 HK mag, fyi. Thanks!