Congrats on your DM9 - I love mine! Still one of my most quiet and smoothest shooting markers out there.
Parts Kit - or O-Ring supply (Keep them on hand just in case you need them)
Lube - I absolutely Love Monkey Poo
Trigger - Critical with the repelling magnetic return - freaking snappy and awesome.
As far as bolts Price wise - there was a killer BillyWing bolt with a can even in the B/S/T for cheap....
I went 3 ways and tried them all.
1) Pooty51 - polished bolt/can
2) BillyWing Bolt - Dye Polished setup and tophat
3) TechT L7
I liked them all really, I think TechT gets a bad rap on their L7 bolt for the DM/PM series because setup is so different from the "norm" Most of "us" DM owners try to run the Lowest LPR possible, and a high dwell. With the L7 the LPR is all but wide open, and the dwell super low. I can still put my finger into the breech and it's soft...... but people have a hard time on getting it setup properly.
Anyway - I love the stock - DM bolt and I think you will find on here that every one loves it!
Love my DM9 and PM8
My Current Markers:
(Exclusively Using Monkey Poo Lube
/ Gun Sav Lube
MacDev Clone GT
Black/Green = Ninja Air 550psi 70/4500 = Seed Rotor
Black/Green (Pooty51 Polished NDZ Can/BubbleGum Flat Face Bolt) = Ninja Air 550psi 70/4500 = Seed Rotor
Black/Green = Ninja 550psi Reg'd Crossfire 70/4500 = Seed Rotor
DigiCam Midnight (Virtue OLED) = Ninja Air 68/4500 = Seed Rotor
Midnight = Ninja Air 68/4500 = Seed Rotor
Champagne (Pooty51 Polished Bolt / Virtue OLED) = Ninja Reg'd CrossFire 70/4500 = Seed Rotor
. . BattleField Orlando