I have to agree with those who say that in a SHTF situation, 50 lbs of weapons and ammo isn't the best choice.
Weapons are important, but frankly if you get into a firefight you're probably screwed.
I've been following the "prepping" hobby for a while, and interestingly one of the likely major natural-SHTF situations, the eruption of the Yellowstone Caldera, makes many preppers' SHTF plans and property purchase choices questionable... many assumed that retreating to the interior was the best option. Wyoming, Montana... and yes, Colorado. If the YC goes, it will be the opposite.
Anyway, yes a pistol and rifle or shotgun are important... but so is food, water and shelter, and the ability to move it on foot or by vehicle, preferably both. Don't forget family members and pets... Katrina forced some people to make hard choices about Fluffy.
I have bug-in options at the house and I have bug-out options for my truck and on foot. All are based on how much warning I have, everything from "run out of the house in your PJs" to an hour or more of lead time.
BTW: It's amazing how little you can reasonably expect to carry on foot.
EDIT: Also it's important to discriminate between SHTF and TEOTWAWKI. People have different definintions, but for me anything where I can expect to be able to buy/ aquire coffee regularly at some point in the future is SHTF, TEOTWAWKI is when I can't expect to aquire new coffee in the forseable future (more than a year).
Prepping for SHTF is fairly easy... life will eventually return to normal, you just have to outlast it.
Prepping for TEOTWAWKI is more of a lifestyle, involves learning antiquated skills which will PROBABLY never really be put to the test, and may make your relatives and neighbors think you're nuts.
OTOH, if you're ready for TEOTWAWKI then you're ready for any type of SHTF.