We are wanting to open the kitchen to the living room a little more. We are needing to tear out a wall where another wall meets it in a "T". Would this be safe if it is only about a 5 foot section?
The entire wall will not be tore down, only about a 4-5 foot section of it.

Load bearing walls can go in any direction in relation to your floor or ceiling joists. If it runs along a joist and that joist is doubled it could be a load bearing. Also see what is above it. If you know who built your house and it is newer you could perhaps call the builder and get the mechanical or architectural drawings.

It is best to get some one who DOES know before you cut anything. Serious damage can occur.

I see a lot of gun safes that store 5+ rifles or shotguns. I don't need or want all that space. Do they sell guns safes for a single rifle and ammunition?

The smallest long gun safe you are going to get is as the first answer indicates, as there is very little to no demand for a single long gun safe.

A better option might be to purchase a lockable metal case that could then be secured to something immobile.

IMHO you should always store ammo in a lockable case away from your firearm(s).

i've used rawlbolts 2 of them and it feels very sturdy although i wasn't satisfied when i tightened them they didn;t seem to offer much resistance and instead just kept turning whilst making very un healthy cracking noises as in the bolts were breaking the block.... but to try and pull the safe from the wall feels very secure..... do rawlbolts become tight like a screw might or is that as tight as they get..... and have i used the best fixings for the job if someone did try to take it i wanted it to be very very difficult..... any info would be helpful thanks

Most safes give you alternative fixing points - I used both the ones in the back and the base - this makes it fairly impossible to put any direct pull in either direction. I would use very long screws and plastic rawlpugs in your situation - the expanding bolts as you have found tend to crush the cement. If you can get to the other side of the block you could use long bolts, with the heads buried in the plaster on the other side, but this will only work on internal walls.

I'm thinking of buying the 12 gun Sentinel gun safe, but I'm not too sure about their quality and construction. I can't even find a website for them.

Inexpensive but functional
They wont keep a pro out or a determined amateur with enough time but they serve the purpose most of us need if they are properly bolted in place

I'm not sure of their fire rating but most safes rely on drywall anyway

If fire is a major concern put a few gallon jugs of water on top of the safe
If a fire gets hot enough the plastic will melt