Check out the New Designz Mini Upgrade bolt. Its like night and day how much lighter it is over the stock Mini bolt. The Delrin bolt is almost weightless. I installed the delrin bolt in my gun, off the bat there is no kick tot he gun at all. The bolt is the only thing that really moves inside the Mini, so when you install a bolt that weighs almost nothing, you don’t feel it move back and forth. I installed the bolt dry (no lube on the bolt). We’ll see how it goes. So far its way worth the $19