dye DM3 with tadao 5.0, C4 backplug, kapp bio sleeve, modded bolt stop, cp reg, scm3
Its super slick and weighs half as much as the stock piece.
You need a different size o-ring on the bolt sail.
i picked mine up on ebay for 11 dollars so i couldnt go wrong with that. when i first got it the first thing i noticed was the weight, about half the weight of the stock piece. it was much slicker and lets you run the lpr about a full turn down. I have only played with it in my gun once at the field and noticed my velocity was a very close spread i dont know why it made a difference with it but it did. i was shooting 284 286 285 285 which is damn good. all day long it stayed above 280 and never went above 288.
Buy the damn thing !!!! how could you go wrong. its light fast and the cheapest upgrade. Go get it now!