Originally Posted by BigEvil
Have fun with these "efficiency" upgrades if you are using them in anything other than a pump mag. There is a reason why AGD enlarged the powertube 20 years ago
It seemed Hill had good luck with his in a Classic valve. I thought these inserts were a good thing since I've never heard anything bad and seen hill's results. Can you elaborate on your statement please, as I am interested now. I hope i'm not coming across as rude as that is not my intent I just want to hear any negative aspects of these inserts.