The manual clearly states lubing procedure. Use silicone grease to lube orings on the bolt, bolt guide, and poppet (avoid lubing the poppet seal). Do not use oil based lubricant.
Pickup some TechT GunSav or Sl33k and lightly lube all o-rings on the bolt guide and bolt. Open up the poppet and lube the o-ring on there as well. That's pretty much it unless you're having problems elsewhere.