This is what 2A Armament says:
Building on our experience with lightweight firearms, 2A Armament set out to design a custom contoured 18" lightweight (31.5 oz) .308 barrel. This barrel will ship as standard with our Xanthos rifle but is also available for individual purchase.
Features:
4150 Barrel steel with QPQ Nitride
.308 Caliber WIN MATCH
Length 18"
Rifle-length gas system .081 gas port
1:10 twist, 5R rifling
5/8-24 muzzle thread (.625 thread length)
.750" diameter x 1.0” long gas block journal
11 deg target crown
LR-308 (DPMS Compatible) extension
Weight - 1 lb 15.5 oz
18 2A Lightweight .308 Barrel
SKU: 2A-C308L18PB-1
$289.00 Regular Price
$274.55Sale Price