$69 AR lowers @ AIMsurplus

[Wiley-X]

But this receiver can definitely handle the pressure produced by 5.56 NATO loads, right?

The AR15 lower doesn't need to deal with the pressure of the fired cartridge, it is simply a housing for the trigger group and a way to hold the buttstock on.

[knight0334]

But this receiver can definitely handle the pressure produced by 5.56 NATO loads, right? I did hear that 5.56 NATO is a high pressure caliber, which not all receivers can tolerate. Also, why is it that most receivers cost at least 2x as much as this item listed? Is this just a super-good deal? Or has quality been compromised somewhere?

Should be able to handle the pressures. There are other factors as to why prices are low.

like:
supply & demand
over-production
slight errors
clearance for newer models
clearance to pay bills
reduced manufacturing costs

[Tomcat088]

But this receiver can definitely handle the pressure produced by 5.56 NATO loads, right? I did hear that 5.56 NATO is a high pressure caliber, which not all receivers can tolerate. Also, why is it that most receivers cost at least 2x as much as this item listed? Is this just a super-good deal? Or has quality been compromised somewhere?

The receiver's main job is to hole the lower parts (trigger, springs, magazine, stock, etc) of the rifle together. It does not have to tolerate any real significant pressures. The caliber is determined by the "upper" that you put on the lower, and what the barrel is chambered for. Obviously as others have said, you can only go so large before the lower dimensions cannot accomodate the cartridge. Either way, it is the chambering of the barrel and the bolt carrier group that will need to tolerate the pressures. The short answer to your question is yes, you can built an AR with the right upper, that will handle pressures of the 5.56 NATO. Notice, you MUST have the rifle chambered properly.

Edit: sorry to sound like a parrot, others beat me to it

[Berks_Iraq_Vet]

>50 Beowulf will work on standard AR Lower.

[1blindref]

Don't forget the 458 Socom. It even uses the .223 / 556 mags.

[NikeBauer21]

Don't forget the 458 Socom. It even uses the .223 / 556 mags.

You have a .458 IIRC, don't you?

[1blindref]

You have a .458 IIRC, don't you?

Yes I do.
I just finished putting it together a couple of weeks ago. I haven't shot it yet as I'm having trouble finding ammo for it.

[NikeBauer21]

Yes I do.
I just finished putting it together a couple of weeks ago. I haven't shot it yet as I'm having trouble finding ammo for it.

Nice.. Yea, that's the only problem with it....

[1blindref]

Nice.. Yea, that's the only problem with it....

I think reloading will be a must sooner than later.

[orionz06]

Wow that's pretty cheap. So what's the difference between the difference generations? Anyone know?

99% sure it is just markings