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6061-t6
6061 (Unified Numbering System (UNS) designation A96061) is a precipitation-hardened aluminium alloy, containing magnesium and silicon as its major alloying elements. Originally called "Alloy 61S", it was developed in 1935. It has good mechanical properties, exhibits good weldability, and is very commonly extruded (second in popularity only to 6063). It is one of the most common alloys of aluminum for general-purpose use.
It is commonly available in pre-tempered grades such as 6061-O (annealed), tempered grades such as 6061-T6 (solutionized and artificially aged) and 6061-T651 (solutionized, stress-relieved stretched and artificially aged).
AR-10 .308 handguard AND barrel nut,
17 inch in length, free floating,
LR-308/DPMS friendly fitting,
high profile, full top rail,
6061-T6 lightweight aluminum,
width 1.66"
height 2.09"
inside diameter 1.49"
weight 16 ounces
$150 OBO.
I also have a 20" barrel for sale.