That is a really old pic from when we did source Vltor tubes and must have got missed when we did the new website. I will fix it on Monday.
To be clear, Vltor is not making our extension.
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+1 for LMT(2), Colt(2), VLTOR(2) & CMT buffer tubes. I have these on all my ARs. My only gripe with Colts are that they are 4-slot but that is really a moot point.
The last LMT receiver extension I bought directly from LMT is a little rough looking but it functions fine; however, the LMT receiver extension on my KAC SR15 is a thing of beauty. As far a function, the one I bought from LMT works great but I would prefer it was as nicely finished as the one on my SR15.
I might cut some in Titanium very soon for R&D. If I like how they turn out I might sell them. I know not everyone will care it's over twice as strong but some will realize it's a part that will now have even a less chance of fail. Lol. So when LAV drops the rifle out of a helicopter the buffer tube will not bend like the Daniel Defense one did.
I love the A5 system. That's what I would go with. But otherwise, be sure it's 7075-T6 and cut right.
Damage Industries makes a good 7075 RE.
It's not. Both of the places that will brake render the rifle useless. The buffer tube and the back of the receiver. Both are weak points on the rifle under extreme circumstances. Both can be fixed with a stronger material with minimal weight gain for that size part. I believe it's cost that has stopped it from being done in the market. As for me, I will never believe a weapon which I trust my life to can be too well built. There are too many things that can happen which are not thought about of course unless it happens. If I buy a weapon I want to know it will be there if I need to pull the trigger till the day I decide to get rid of it. To me this would just be a step closer in that direction.
But sorry. Back on topic of what is available now. 7075T6 Forgings and Impact Extrusions are your best choice. Most of the good manufactures buy from reputable metal companies and should take measures to not over stress the metal in the machine process( If they do the work, not buy from another company). I think LMT is a great choice which is on most of my rifles to date. But so is BCM which is on the rest. But you should be good from any of the good companies out there. DD, Colt, Noveske, LMT, BCM.......