It's not the SS tank that is fixed.It's the Savage25 RTR that is going to be released in the next few weeks that has the updated tank on it.You can use this tank on your Savage21 when it is released but that could be a couple of weeks.I'm going to buy it when it comes out and see if it works better than my Ofna Tank.The only downside to the Ofna tank is the decrease in run time.The Ofna tank is 125cc while the Savage tank is 160cc.Hopefully HPI got it right this time and I can have the increased runtimes again.