New Sharps Relia-Bolt design using S7 tool steel.

[BufordTJustice]

Here it is:

http://www.alloutdoor.com/2014/01/08...ia-bolt-ar-15/

The Sharps Relia-Bolt. I'm just not liking the Np3 coating, the untested S7 steel (in this high shock-loading and repetitive temp-cycling capacity), or the altered lug profile. But, I could be off and it could be a leap forward.

Can a metallurgist (or somebody familiar with S7 tool steel) opine on this?

[WAR FACE]

They where working on this a few years ago. I had not heard about Shapes in a long time figured they went under. Sharps sent out a bad batch of receivers early on and got a bad rep. S7 steel is suppose to be real high grade from what I understand.

[markm]

"Self Lubricating" "Self Cleaning".... BS flag and alerts right there. I've an NP3 bolt that is BLACK. You can't even tell it's NP3. Works fine, but most certainly isn't cleaning it'self.

[hk_shootr]

Snake oil BS.........

[Eric D.]

S7 is a tool steel made by Carpenter Technologies. It has very high impact toughness (the ability to absorb energy) and shock resistance. It can be air or oil quenched but cannot be hardened as much as other tool steels. It also resists softening at high temperature. S7 also has a tensile strength much higher than C158.

[BufordTJustice]

S7 is a tool steel made by Carpenter Technologies. It has very high impact toughness (the ability to absorb energy) and shock resistance. It can be air or oil quenched but cannot be hardened as much as other tool steels. It also resists softening at high temperature. S7 also has a tensile strength much higher than C158.

Thank you for the info. Which is more expensive between the two?

[Regalkismet]

"Self Lubricating" "Self Cleaning".... BS flag and alerts right there. I've an NP3 bolt that is BLACK. You can't even tell it's NP3. Works fine, but most certainly isn't cleaning it'self.

I think you confused NP3 with NiB...They ARE different... NP3 is superior to NiB and NP3 does NOT hold carbon and turn black.... That is a trait indicative of a NiB coating..... And I thought you claimed to know it all... Lol

[Digital_Damage]

I think you confused NP3 with NiB...They ARE different... NP3 is superior to NiB and NP3 does NOT hold carbon and turn black.... That is a trait indicative of a NiB coating..... And I thought you claimed to know it all... Lol

Well that is not true Np3 will turn black just like any other coating that does not get cleaned.

[Regalkismet]

Well that is not true Np3 will turn black just like any other coating that does not get cleaned.

Really? We are talking about holding the carbon after cleaning...NiB will hold the carbon...NP3 will clean up...of course something that isn't clean and is dirty will be dirty.

[vicious_cb]

I think you confused NP3 with NiB...They ARE different... NP3 is superior to NiB and NP3 does NOT hold carbon and turn black.... That is a trait indicative of a NiB coating..... And I thought you claimed to know it all... Lol

This is true. NP3 has a smoother surface than NiB which has microscopic pits that can hold carbon even after cleaning which leads to discolorization. However the discoloration should not affect function. Neither are "self cleaning" they only offer a lower coefficient of friction.