I have an excellent cond. Bushmaster Dissipator upper post ban with crowned muzzle and crome lined bore. It has been fired about 800 times so it is still in really nice shape. I want a nice M-4 type upper instead. I want something light weight. Looking for a Rock River or a Bushmaster, prefer Rock River as that is what my lower is. I need a bolt and carrier also. I have the charging handle.
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