Everything is good about this bolt !i have never chopped a single ball in my BM2K after putting in this bolt.is shoot much more accurate. It Fit Perfect but some people i guess had a problem with there bolts which i did not. If you want to upgrade your gun get this bolt even before a barrel.
The performance rocks with the Red bolt so i dont see a point in having the black one so to lower the price they should just get rid of the black one all together.
I dont see any bad points on this bolt the only people who dont like it probably messed up there gun or shot some brass eagle paint or somthing. but buy this bolt now it is well worth it the accuracy is in the bolt and barrel and I was using the stock barrel with this bolt and it ruled. The people that put this bolt down have somthing wrong with then and there guns if they think this bolt is not good.