I was wondering if anyone has any information on where I could get a 20 inch upper for AR's. It seems like they're really hard to find either a full rifle or just the upper. Also, is there anyway you can buy a complete rifle or build a rifle for under $1000? I did see one from BCM but I'm I correct in saying that those are not allowed in Massachusetts ?? If anybody has any information on this that would be great I'd really appreciate it.