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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Fisher Space PenNonReflective Military Cap-O-Matic Matte Black (SM4B)

Fisher Space PenNonReflective Military Cap-O-Matic Matte Black (SM4B)

Product ID: 253936367

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Details

Brand
Fisher Space
Writing instrument form
Ballpoint Pen
Colour
Matte Black
Ink colour
Black
Age range (description)
Adult

🚀Trusted by astronauts & pros

🖊️Writes at any angle, even upside down

❄️🔥Operates from -30°F to 250°F

Description

🖋️ Write like a pro, perform like an astronaut.

BUILT TO ENDURE - Matte black brass body with snap closure ensures durability and a sleek, professional look that lasts.
ONE HAND ACTIVATION - Cap-O-Matic design lets you deploy the pen quickly with a single hand—perfect for multitasking pros.
WRITE BEYOND LIMITS - Effortlessly jot notes upside down, underwater, or in zero gravity—because your ideas don’t wait.
SPACE TESTED RELIABILITY - Used by astronauts, engineers, and adventurers alike—join the elite who trust Fisher for critical writing.
PRECISION IN EVERY STROKE - 0.5mm tungsten carbide ball tip delivers smooth, consistent lines for flawless documentation.

The Fisher Space Pen NonReflective Military Cap-O-Matic Matte Black (SM4B) is a rugged, precision-engineered ballpoint pen featuring a durable brass body with a matte black finish. It writes smoothly at any angle, in extreme temperatures from -30°F to 250°F, and even underwater. Trusted by astronauts and professionals across industries, its 0.5mm tungsten carbide tip and one-hand snap activation make it the ultimate tool for reliable, high-performance writing anywhere.

Specifications

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

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