Disregard

[Shooting Wads]

This issue has been resolved.

I received a complete lower from PSA and I can not determine if the receiver extension is made from 6061 or 7075. I want to be clear that I am only trying to determine what material it is made of, not if it is commercial or "mil-spec". Furthermore, I understand the differences between the two. I am confident that what I received is made of 6061 based on my comparison to a 7075 tube, but I want to verify this.

PSA believes it is made of 7075 but I'm not convinced. I need some piece of mind! Please post photo's of your 6061 and/or 7075 receiver extensions, including the inside of the receiver extension, and feel free to share your thoughts.

I have included 5 photo's, some with and without flash. Every photo except "PSA 5" is the item in question. For comparison purposes, "PSA 5" is a 7075 extension. From my perspective, there does not appear to be dry film lube compared to the 7075 tube, nor does it feel like slick.

[Active Shooter]

It's definitely 6061. I'm a materials engineer and the grain structure is a dead giveaway for 6061.

[stealthmode]

how did you determine what material the tube is in the pictures?

[Shooting Wads]

how did you determine what material the tube is in the pictures?

I came to this conclusion based on the lack of dry film lube on the inside. A 7075 receiver extension has dry film lube. Furthermore, 6061 tubes are typically darker in color in comparison to a 7075 tube.

[stealthmode]

I was speaking of the other poster

"It's definitely 6061. I'm a materials engineer and the grain structure is a dead giveaway for 6061. "

[GunnyUSMC]

I came to this conclusion based on the lack of dry film lube on the inside. A 7075 receiver extension has dry film lube. Furthermore, 6061 tubes are typically darker in color in comparison to a 7075 tube.

You do know that a dry film lube can be applied to the inside of any buffer tube.
Also, Aluminum Anodizing can be done in different colors and the shade can very.
These lower came from the same Co. ordered at the same time and arrived on the same date. They say they are made of 7075 but the one on the top is darker then the other two, but lighter then the ones I got from them on my last order.


But does it really matter. I have seen both 7075 and 6061 buffer tubes brake. Most often it is due to miss use are abuse buy the owner.

[Shooting Wads]

You do know that a dry film lube can be applied to the inside of any buffer tube.
Also, Aluminum Anodizing can be done in different colors and the shade can very.
These lower came from the same Co. ordered at the same time and arrived on the same date. They say they are made of 7075 but the one on the top is darker then the other two, but lighter then the ones I got from them on my last order.

But does it really matter. I have seen both 7075 and 6061 buffer tubes brake. Most often it is due to miss use are abuse buy the owner.

I am aware of that, thanks. The point I'm making is that dry film lube is not found in 6061. Sure, anything can break if you abuse it, but the reality is that 7075 is stronger. I won't settle for anything less.

[kcheung2]

While I'm a fan of PSA, I hope you realize that the crowd that "won't settle for anything less" are looking a bit higher up the market.

[Shooting Wads]

While I'm a fan of PSA, I hope you realize that the crowd that "won't settle for anything less" are looking a bit higher up the market.

I was speaking in relative terms. I can't imagine a reasonable person would argue that there is a significant difference between a PSA and BCM 7075 tube. On the other hand, there are better options for a 7075 receiver extension (i.e. Magpul). However, these PSA tubes are likely sourced from a manufacturer that supplies receiver extensions to many vendors.

[Sicarius]

Their premium line has the 7k AL buffer tube.
Kevin