i ued to shoot with somebody who owned a lightning xl and they are really twangy he stripped it down and it was dry as a bone inside and quite shabby engineering inside so he just gave it a full strip down polish and regrease and it is a lot better still got a twang but no to bad i not to sure but have been told that they have been getting made in spain for a while now so that could be reason for standards dropping , i jst had my lightning mk1 tuned and it very smooth and no twang just a solid thud i had it stripped polished new piston seal,breechseal,spring,guide,tophat and weight it still ai