does this refill fit the AG7 model pen?

I am not sure. The packaging doesn't reference which Fisher pens this refill will work with, but it comes with an adapter which makes it longer. I use it without the adapter for the Fisher Space Bullet pen. According to the description on Amazon, this refill should fit most Fisher pens.

Anybody know the actual size of the tip?

I'm not exactly sure what Tip your talking about but the end of the cartridge is just under 3/32" (0.086") which is just above 1/16" and the ball is about 3/64" (0.0469") which is just below 1/16". if you need more clarification I can measure the cartridge more.

will this fit a cross pen?

No, it fits Parkers ( with the adapter) and fisher

Will it fit in the ti-pocket pro? (big idea company llc)

I watched the ti-pocket pro video and I would say no.

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🖊️ Write like a space explorer, perform like a pro.

TRIPLE REFILL PACK - Stay ahead of deadlines with three pressurized cartridges—because running out is not an option.
WRITE BEYOND LIMITS - Effortlessly scribble upside down, underwater, or even in zero gravity—no other pen dares to perform like this.
PREMIUM BUILD QUALITY - Crafted with solid brass and steel, this pen is as tough and reliable as your ambition.
EXTREME TEMPERATURE PROOF - From Arctic chills to desert heat, your ideas flow uninterrupted between -30°F and 250°F.
VIBRANT BLUE FINE POINT INK - Make every word pop with crisp, professional blue ink that commands attention.

The Fisher SpacePen 3-pack features pressurized blue ink cartridges with a fine point tip, engineered to write flawlessly at any angle—even in zero gravity—and in extreme temperatures from -30°F to 250°F. Built with durable brass and steel, these refills ensure your pen stays ready for every challenge, making it the ultimate writing tool for professionals who demand reliability and style.

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Manufacturer	Fisher Space
Brand	Fisher Space
Model number	BUN-SPR1F-x3
Product Dimensions	22.86 x 15.24 x 0.51 cm; 18 g
Color	blue
Point Type	Fine
Ink Color	Blue
Manufacturer Part Number	BUN-SPR1F-x3
Item Weight	18 g

Fisher Space Pen - 3 Pressurized Cartridges Blue Ink Fine Point #SPR1F

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