Originally Posted By xwarp:
i bought an "arizona armory" lower several months back. very smooth and nice looking. i sold it off and bought a double star receiver to replace it. although it was very clean, i found that i just liked the forged better. the az armory receivers are manufactured by sun devil and i believe them to be made from 6061 aluminum, which considering the application, i'm sure was strong enough, but it felt "light" to me in comparison to the forged. (that's my excuse anyway..lol). actually, the reason for selling was more due to cosmetics......meaning...it was just too pretty for me.....
6061 T6 has 2/3 the strength and hardness of 7075 T6
I'm making small batch billet 80% lowers right now. Using Kaiser's 7075 T651 this stuff is top notch. Forging vs Billet is almost the same as long as they are the same base material. 6061 vs 7075 is like the AK rivet vs screw build issue. One material is strong enough to function safely the other is the spec and is more durable and longer lasting. In the small batch world I'm working with now, things are mainly 6061 for ease of production. I'm making these to last. No elongated pin holes. Will not dent or ding easily. Strong, durable and great for a precision rifle build.
One other note. Someone mentioned that the billet allows freedom of design. Because you're not constrained to work within the size restriction of a forging, you can get creative. You can add style, personality and strength.
This image is from my first batch. Made a whole whopping 43 of them. Cut from a 12 foot long bar of 7075... (gen2 coming out Tuesday April 7)