The SR-fifteen E3 MOD 2 sequence’ 5.56mm NATO barrel is made for army grade toughness, and is particularly free-floated inside a URX4 M-LOK handguard. An improved E3 spherical-lug bolt style and design both of those improves perform and increases bolt daily life far outside of the field common.Qualified Made use of GUNS Guns Certified Utilized Gu