This is the A3 removable carry handle model with M4 profile barrel and the mini Y-comp muzzlebreak. I bought it brand new and it has seen (no lie) only 20 rounds! The barrel was cleaned and it has been in my safe ever since. It is as brand new as it came from Bushmaster. I will ship to your FFL for $765. For serious inquirys only EMAIL me and I will send pics!