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 like a pro, anywhere, anytime.

BUILT FOR THE BOLD - Matte black, non-reflective finish designed for tactical stealth and professional style.
ONE HAND ACTIVATION - Snap-cap design lets you deploy your pen with a single hand—speed and efficiency in your pocket.
WRITE BEYOND LIMITS - Effortlessly jot notes upside down, underwater, or in zero gravity—no angle too extreme.
TRUSTED BY TRAILBLAZERS - Used by astronauts, military, engineers, and adventurers who demand absolute reliability.
TEMPERATURE PROOF PERFORMANCE - Reliable ink flow from freezing cold to scorching heat, perfect for any environment.

The Fisher Space Pen SM4B Military Cap-O-Matic features a rugged matte black brass body with a snap closure and tungsten carbide ball tip. Engineered to write smoothly at any angle, including upside down, and in extreme temperatures from -30°F to 250°F, it’s trusted by military personnel, astronauts, and professionals worldwide for unmatched reliability and stealthy style.

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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

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

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