Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Is this good to open food can or Ammo can? i.e. the Mosin Can Ammo
Document: Good to be able to open a can of food. Using a knife can cause pain when it slips. Better to have a can opener on hand.
Had two back in old days when out in woods mtn. and no electric. Ask any Veteran how good it be to have one. Now that am on the road and far from any place to reach when traffic stop and there no where to get food ( can goods ) open.
Consider this: a storm ragaved your town. You have food, but its all canned. Three days without power, and there is still no clue when they will get it back on. The fridge is empty, the freezer about the same, and what's left wont last long. Canned food.....sounds good, but how will I open it.....solution: this product.
I received two of these p51' and I am glad I ordered them. If there is a need for an emergency can opener I think this product will do the job. Be sure NOT to get the knock off types, get the official miltitary type, which says Shelby on them. Hopefully none of us will ever have to use one of these to open up a canned good. However, it is good to know that one can access food using this item.
Best can opener-bar NONE-manual or electric. I have four of 'em, and I'm gonna buy a gross (144) of them to barter for food and ammo, for when  The feces hits the oscillator.
Love these, strong enough to open ammo cans !! !True MilSpec Issue P-51 !! !I gonna order more just because !! !
Pretty good can opener,seems to be much better than the old P-38's they used to issue GI's, although I have opened many cans of food with a &#34;P-38&#34;
Have you ever opened a can of food with a pocket knife? I have, I still have all my fingers, I have also watched others try it, it is terrifying to watch, I sit waiting with needle and thread ready to sew their fingers back on. Good device to have if you are not handy at cutting sheet metal with cold steel.
They're really handy when the pull tab on food cans, like sardines, break before you open the can completely.
I have no idea how easy it is To open a can of food was something so simple yet very lightweight. A must-have for a bug out bag.
Answer: These are designed for small cans of soup and other household food cans.I would recommend A heavier duty CanOpener with good handles for good leverage to open the Ammo tins I have seen. These are really designed for a camping substitute for household kitchen can openers.