Question 1

is this knife "waterproof",  or will it rust in water with chlorine in it?  (pool)

Accepted Answer

Tony V. gave a great answer.  First, there are many different types of stainless steel, all with different properties.

First, understand what "stainless steel" means.  It does NOT mean absolute resistance to corrosion (rust). The metal can be attacked by oxidizing agents. 
"Stainless" only means that it "stains less" than other ferrous metals which are reactive to oxygen, chlorine, salts, etc.  Gold is one of the few metals that is relatively inert.

Many surgical instruments and cutlery is made with 440 stainless steel.  To have further resistant to rust, 304 stainless steel is used.
For the most corrosive environments, such as marine fittings exposed to seawater, 316 stainless steel is used.  But there is a trade of in other properties. 
So yes, you have to care for any good knife if you want it to last and keep an edge.  Carbon steel readily discolors and easily rusts, but it takes an edge and holds it better than stainless steel.

Buy the best knife that you can afford, for the qualities that are most useful to you. 
And then take care of it, and it will serve you well.  Take it for granted, or neglect it, and it's going to go sour on you. 
Treat your knife with respect, and it will probably last longer than your marriage.

Question 2

What is the current quality of the knife? Does the sheath scratch the blade?

Accepted Answer

The overall quality is excellent. I own 22 different knives in this same class and this one is my "go to" knife. Over time, Yes, the sheath will wear on the blade and dull the black finish. Two ways you can prevent this...1.) buy a leather or nylon sheath...or, 2.) keep the blade lubed. The dulling of the black finish does not affect the performance, durability, or functionality of the knife.

Question 3

What is the difference between this model, 8668, and the other one, 8604?

Accepted Answer

8604 was the old OKC # of the original knife before the Randall Adventure Team got involved with the knife and the knife got the new designation of RAT-7.

Question 4

Is the bolster/guard made out of metal or is it plastic?

Accepted Answer

The guard is made of metal. The handles are plastic.

ASIN	B000UU7ZFS
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#853,644 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3,210 in Fixed Blade Hunting Knives
Blade Edge	Plain
Blade Length	6 Inches
Blade Material	Stainless Steel
Blade Shape	Straight
Blade Type	straight edge
Brand	Ontario Knife Company
Brand Name	Ontario Knife Company
Color	Black
Customer Package Type	Basic Protective Sheath
Customer Reviews	4.5 out of 5 stars 291 Reviews
Global Trade Identification Number	00071721061410
Hand Orientation	Ambidextrous
Handle Material	Plastic
Included Components	Sheath
Is Product Cordless	Yes
Item Length	10.75 Inches
Item Type Name	Ontario Knife Co MK 3 Navy Knife
Item Weight	1.1 Pounds
Manufacturer	Green Supply
Model Name	1061410
Model Number	6141
Orientation	Vertical
Part Number	1061410
Power Source	AC/DC
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Camping
Reusability	Reusable
Size	6"
Special Feature	Water-Resistant
Special Features	Water-Resistant
Style	Fixed Blade
Theme	Sport
UPC	730707310835 658804124752 071721061410
Unit Count	1.00 Ounce
Warranty Description	SEE MANUFACTURER

Ontario 6141 MK 3 Navy Knife (Black), stainless steel

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