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 Time

ZERO GRAVITY WRITING MASTERY - Effortlessly jot notes upside down, in space, or on the go—no gravity needed.
EXTREME TEMPERATURE RESILIENCE - From Arctic chills to desert heat, your pen performs flawlessly between -30°F and 250°F.
PRECISION ENGINEERED HAND TESTED - Each pen is meticulously assembled and tested to guarantee flawless performance.
RUGGED MILITARY GRADE CONSTRUCTION - All brass and steel body ensures durability that stands up to your toughest days.
LIFETIME GUARANTEE FOR LIFELONG RELIABILITY - Invest once, write forever—backed by Fisher’s unbeatable lifetime warranty.

The FisherSpace NonReflective Military Cap-O-Matic Space Pen in Matte Black is a precision-engineered writing instrument designed for professionals who demand reliability anywhere—from zero gravity to extreme temperatures. Featuring a tungsten carbide ball tip and all-metal construction, it writes smoothly at any angle and is backed by a lifetime guarantee, making it the ultimate pen for those who refuse to compromise.

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Manufacturer	Fisher Space Pen
Brand	Fisher
Model Number	SM4B
Product Dimensions	13.34 x 1.27 x 1.27 cm; 0.28 g
Colour	Matte Black
Closure	Snap
Grade	0.5
Grip Type	plastic plain grip
Pencil Lead Degree (Hardness)	B
Material Type	Multi
Number of Items	1
Size	1 count (Pack of 1)
Point Type	Medium
Line Size	0.5mm
Ink Colour	Black
Tip Type	Tungsten Carbide Ball
Manufacturer Part Number	SM4B
Item Weight	0.28 g

Fisher Space NonReflective Military Cap-O-Matic Space Pen, Matte Black (SM4B)

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