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—anywhere, anytime.

MADE IN THE USA - Proudly engineered and manufactured domestically, ensuring top-tier quality and reliability.
TRIPLE INK POWER - Comes with 3 pressurized blue ink refills—never run dry when inspiration strikes.
WRITE BEYOND LIMITS - Effortlessly jot notes upside down, underwater, or even in zero gravity—because your ideas don’t wait.
PREMIUM BUILD QUALITY - Crafted with solid brass and steel, it’s the pen that feels as professional as you look.
EXTREME TEMPERATURE PROOF - From Arctic chills to desert heat, this pen keeps your thoughts flowing without skipping a beat.

The Fisher Space Pen #SPR1F features a fine blue ink point with pressurized cartridges that write smoothly at any angle, including zero gravity. Built with durable brass and steel, it performs flawlessly in extreme temperatures from -30°F to 250°F. Each order includes three refills, making it the ultimate versatile pen for professionals who demand reliability and style.

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Manufacturer	Fisher Space
Brand	Fisher Space
Item Weight	0.634 ounces
Product Dimensions	9 x 6 x 0.2 inches
Item model number	BUN-SPR1F-x3
Is Discontinued By Manufacturer	No
Point Type	Fine
Ink Color	Blue
Manufacturer Part Number	BUN-SPR1F-x3

FisherSpace Pen - 3 Pressurized Cartridges Blue Ink Fine Point #SPR1F

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