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 space pro, anywhere, anytime.

BUILT FOR EXTREMES - From Arctic chills to desert heat, your notes stay flawless between -30°F and 250°F.
WRITE BEYOND LIMITS - Effortlessly scribble upside down, underwater, or in zero gravity—no pen has your back like this.
TACTICAL MATTE BLACK FINISH - Non-reflective stealth design trusted by military pros worldwide—blend in while standing out.
LIFETIME GUARANTEED PRECISION - Hand-assembled and rigorously tested for a lifetime of flawless performance—no compromises.
SOLID BRASS STEEL CONSTRUCTION - Engineered for rugged reliability, this pen is as tough as your toughest meetings.

The Fisher Space NonReflective Military Cap-O-Matic Space Pen in Matte Black is a precision-engineered writing instrument designed for extreme conditions. It writes flawlessly at any angle—including zero gravity—and functions reliably in temperatures from -30°F to 250°F. Crafted from all brass and steel with a non-reflective matte finish, this pen is trusted by military forces worldwide and backed by an unconditional lifetime guarantee.

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Manufacturer	Fisher Space Pen
Brand	Fisher Space Pen
Item Weight	0.01 ounces
Product Dimensions	5.25 x 0.5 x 0.5 inches
Item model number	SM4B
Is Discontinued By Manufacturer	No
Color	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	1.1 Millimeters
Ink Color	Black
Tip Type	Tungsten Carbide Ball
Manufacturer Part Number	SM4B

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

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