The TROY A3 Defender 5.56 is our sleek, optic ready carbine that carries on TROY’s reputation for legendary reliability. The A3 Defender’s mid-length barrel is chambered for 223 Wylde with a 1:8 rifling twist. It’s equipped with an A2 Flash Hider Our slim, snag-free SOCC Rail gives you a rigid platform to mount essential M-LOK® accessories to fit your needs. The SOCC locks to the A3 Defender’s mil-spec steel barrel nut with our quad-lock system, so you don’t have to worry about your rail losing zero in the toughest environments.