SP-8, lucky stages 1,2,3 , powerlyte scepter kit
Strong, smooth construction. Easy to use, cleaner than stock
None, that I could see.
I purchased this as a set with stage 1 and 3. I am pleased with the efficiency I gained with this. I don't have specific numbers but it was apparent during play. I don't think it is worth using if you don't get the lucky bolt though. Simply put, as a set this upgrade makes perfect sence. on its own with the stock bolt I say save your money and buy the bolt.