What size is the small O ring that comes in the A5 O-ring kit?

Also, does anyone know of a source of neoprene O-rings (or ones that would resist cold better)

I think this is the size that fits in the female end of my remote. I put one in, and it seems to work fine - I'd like to keep a supply of them on hand for when I keep blowing them out like an eejit.

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Try your local auto parts emporium for neoprene O-rings. They are available in a bewildering variety of sizes for use in automotive air conditioning systems. The easiest way to go about it would probably be to bring the O-ring in question with you and match it up with whatever selection they have on hand (you'll probably have to ask at the counter, as O-rings usually come in large select-a-packs).

How small? There is a very tiny one on the banjo fitting for the cyclone. I wouldn't have known it was there if I hadn't been watching maintenance videos.

Got the answers I needed. The small O-rings are the Safety O-rings. I called Tippmann and their R&D guy was very helpful. One can order them as a 2-006. The Safety O-ring is a 60 duros and the quick release is a 90 duros to help it resist the cold.
(OD .254 and a cross of .070)

I just ordered 100 of them from C-3Services.com

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What does 2-006 exactly mean? Trying to understand.

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The 006 most likely refer to a Standard Oring with a 1/8 (ID), 1/4 (OD) and a cross section of 1/16. Not sure what the 2 dentoes though.

Here's a sizing chart.

http://www.oringsusa.com/html/as568a.html

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1. A-5 with polished internals, Lapco 12" Bigshot, Lapco 45 offset, Tech Force 47mm Red Dot Sight, and an aluminum skeleton stock.
2. A-5 with a 12" Palmer Brass, Tech Force 47mm Red Dot Sight, and an aluminum skeleton stock.

Metric: 1.5 X 3 mm

This is the same size the SP Ion takes on their Banjo Fittings and Quick Exhaust Valve.

I would guess 2 X 3 mm would also work?