NexTorch - Silicone Grease

The best grease for Nerf o-rings on the market, from what I've seen.
Safe to use on nitrile (which is the main component of o-rings used in foam blaster's).
The grease is rather thick and sticky, which is a bonus in two ways.
1. Adds a bit more to the OD of the o-ring, which helps with plunger seal.
2. Will stick to the o-ring quite well, requiring re-lubing less often.

The tub seems fairly small, but it lasts for quite a while. I've just finished the first jar, and that lasted for about 40 Nerf blaster modifications/commission's.

Also works well on torch o-rings, which is obviously the original intended purpose.