I started with the Pump. Went to the small tank, used that for 2 weeks, then went to a scuba tank. Small tank will last a weekend and then still cost $5-6 bucks to fill, but I had less options to fill it (paintball shops). Scuba tank set up cost less than the small tank, and I can get >50 fills and it cost $5-6 bucks to fill and there are 4 scuba shops within 5 miles of my house. I have not used the pump or small tank since I got the scuba setup. HDD has pros and cons but all in all I like it. I have one Disco set up with the HDD (for stealth and plinking) and one without (for power).
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