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View Full Version : Commercial receiver extension experience? Buffer tubes


Shadowtengu
09-26-2011, 12:46 PM
Quick question. I've been runnin' my new AR pretty roughly. I'm wondering just how much a 6061 receiver extension can take. Is there really a difference between mil spec and 7075? I lay her on rocks, hit walls accidentally on stock and have mortared once on obstacle course. Anyone have any info on commercial tubes? Any help is appreciated.

Nathan Krynn
09-26-2011, 12:49 PM
I have seen them bend more. Also if it hits on the rear corner I have heard of bad things happening.

Nathan

Shadowtengu
09-26-2011, 1:34 PM
How hard of an impact causes bends?

dieselpower
09-26-2011, 1:57 PM
There is no way 6061T5 or 6061T591 is going to break faster than 7075T5 or 7075T6. 6061T591 has a great elasticity and therefore BENDS farther before it breaks.

Commercial tubes made from 6061T5 are cheaper due to the cut threads. Mil-spec 6061T5s are cheaper due to 6061T5 being easier to manufacture and easier to work. Mil-spec threads are rolled and therefore the same as 7075T5 threading. Both will hold up to about the same abuse if both have rolled threads.

Take a 7075T5 tube and cut the threads and it too will snap. The metal has nothing or little to do with the quality. Its the process used to make the tube.

The tubes to NOT buy are the Commercial pot metal ones for $5.99 on e-bay.

Nathan Krynn
09-26-2011, 2:14 PM
I was probably pot metal ones I saw bend.

That corner on the rear does bad things when hit square on it though. thats the reason I do not like commercial.

evidens83
09-26-2011, 5:22 PM
I've been running a commerical tube at the range just fine :eek: It may not be SHTF-approved by the ninjas around here but it gets the job done and thats all that matters ;)

dieselpower
09-26-2011, 6:09 PM
I've been running a commerical tube at the range just fine :eek: It may not be SHTF-approved by the ninjas around here but it gets the job done and thats all that matters ;)

There are no issues with a well built commercial tube. The threads are cut, and the thickness of the metal at those cuts is thin, but unless you are going nuts and butt stroking trees and zombies you will not have a problem.

Now the $5.99 tubes on the other hand will snap just by placing a good amount of force on the rifle while its slung on your body.

evidens83
09-26-2011, 6:11 PM
Wouldn't trust putting anything $5.99 on my AR lol.

Shadowtengu
09-26-2011, 8:59 PM
Cool thanks guys

crazychinaman
09-27-2011, 8:10 AM
I had about three on some of my Ar's for about twenty years .never had a problem.The only reason I changed is that I changed to vltor e-mod stocks.

Shadowtengu
09-27-2011, 1:18 PM
Thanks CrazyChinaMan, that gives me some hope! My castle nut is overkilled staked and would take me, Captain America, Iron Man, The Incredible Hulk, Wolverine, and the damn juggernaut to rip that sucker off. I hope it lasts as long as yours did, I plan to run 25,000 rounds through it and a melonite barrel.

Sunday
09-28-2011, 12:12 PM
Magpul has the explaination on their website. The difference is how the machining is done and from a mechanical point the Milspec is the better unit,,, Does it matter? I would pick the better part.