DPMS uses 7075 T6 Aluminum in line with industry standards - confirmed.
Disregard my original post unless you wish to talk about different aluminums etc.
well - I'm a research kind of guy and I have been snooping again.
Looking at Brownells they list a DPMS lower as 6061 Aluminum
They list a Rock River as 7075-T6 so I google 7075 vs 6061 aluminum and I learn the following.
Google's first hit - an RC car parts manufacturer 7075 vs 6061 Comparison Chart:
(T) Tensile Strength
(y) Yield Strength
Brinell Hardness
6061-T6
(T) 45,000 PSI
(Y) 40,000 PSI
7075-T6
(T) 83,000 PSI
(Y) 73,000 PSI
Metallurgists, What does this actually mean to us? A 6061 lower will crack after 20K rds and 7075 will last 40K rds? Sometimes my researh comes after I have spent my money
I just finished a 20" A3 build using a DPMS lower and have another one in the works. I dont plan on changing anything out but I would just like to know from a practical standpoint what this means. The bolt lugs and barrel extension take the loading correct? Where would a polymer lower fit into this equation?
The only caveat is that I haven't confirmed that the Brownell's description is correct. I have found other errors in their product descriptions in the past....