The Gunsmith Bros Hop-Up Base Set was made specifically for the Tokyo marui Hi Capa GBB and is incredibly tough which will withstand the battering of top gas. This is something that the original version may have trouble with, especially with higher powered gas! For those who dont know who Gunsmith Bros are a well known brand in Asia for quality upgrade parts at a affordable price. Please refrain from installing onto other platforms other than the TM Hi Capa series