Brand new AR57 upper that shoots the 5.7 round. The lower is MGI and comes with both the AR15 standard attachment as well as the AK47 mag attachment (the pictures shows what it looks like with the AK47). This is a very versatile option as you can just change the upper reciever and you have a different rifle. For example, add an AR15 upper and put in the AR15 mag attachment and you have an AR15. Comes with 50rd and 30rd AR57 mags plus 50 rounds of ammo and the AR15 buffer (the AR57 needs its own buffer). All items are never used.