Does anyone know the difference between the SM4B and M4B

I ordered both and the only difference I have found is the SM4B has cheaper packaging. The SM4B comes with a simple cardboard backed print package, covered in a stiff plastic, glued to the cardboard. The M4B comes with a nicer black cardboard box. The Pens themselves are identical as far as I can tell. Both are metal construction with nice clips in matte black.

Does it write in the rain?

According to Fisher Space Pen, their Sealed Pressurized Ink Cartridge "Writes under water", Performs in temperatures from -30ºF to +250ºF, in zero gravity, at any angle–even upside down!

http://www.amazon.com/Refills-Bullet-Fisher-Space-SPR4/dp/B004HGDQQS/ref=sr_1_2?s=office-products&ie=UTF8&qid=1393804261&sr=1-2&keywords=space+pen+refill

Would two of these easily fit into the pen slot on a police uniform left breast pocket? What about a snugger 5.11 Class B breast pocket?

Might be a smidge tight, but two will fit in my uniform pocket. I carry one of these in my shirt and a Fisher X-Mark in my pants pocket as a spare. A bullet pen would work in the pocket, too, but get a clip for it. Otherwise, it will roll off the hood of the squad and your partner will step on it. They're practically indestructible, but the pavement scars them and they look like hell after that. Be careful out there.

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🪐 Write Beyond Limits — The Pen That Defies Gravity and Boredom

RELIABLE INK CARTRIDGE - Includes Fisher PR-4 black ink cartridge ensuring smooth, consistent writing without smudges or skips.
WRITES ANYWHERE ANYTIME - Engineered to perform flawlessly in zero gravity, underwater, and extreme temperatures—because your ideas don’t wait.
PRECISION IN EVERY STROKE - 0.5mm medium point delivers crisp, professional lines perfect for detailed notes and sketches.
SLEEK MILITARY MATTE BLACK - Non-reflective brass body with a stealthy matte finish that commands attention in any boardroom or brainstorming session.
READY TO GIFT READY TO IMPRESS - Comes in a premium gift box—ideal for gifting to the discerning professional who values both style and substance.

The Fisher Space Pen M4B features a durable brass body with a non-reflective military matte black finish, equipped with a 0.5mm medium point and Fisher PR-4 black ink cartridge. Measuring 13.65 cm, it writes smoothly in zero gravity, underwater, and extreme temperatures, making it the ultimate tool for professionals who demand reliability and style. Packaged in a sleek gift box, it’s perfect for gifting or elevating your everyday writing experience.

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Brand	フィッシャー(Fisher)
Model Number	SM4B
Color	Black
Pencil Lead Degree (Hardness)	B
Material Type	Brass
Point Type	Medium
Line Size	0.5mm
Ink Color	Black
Included Components	ink cartridge, gift box
Product Dimensions	13.34 x 1.27 x 1.27 cm; 0.28 g
Shredded Shape	No

Fisher Space Pen - M4B - 非反射ミリタリーマットブラックキャップ-O-マティックスペースペン [並行輸入品]

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