Hi, I got what you need. I have all Bushmaster A3 flat top upper, 20" hbar, flash suppresor and bayonet lug. It has about 300 rounds through it. It does not have a bolt, bolt carrier or charging handle. If you do need a complete bolt carrier assembly I have a LMT enchanced (near new) that I can sell with it. Let me know if interested. Email or IM me.