Purchasing MR556 (Check if it's legit)
A recent MR556 has come into my LGS though it is missing a BCG and a trigger. It has a LMT MARS-L lower on it and that is okay with me though the stock is HK and so is the upper. The store isn't knowledgable on the HK itself since it is used, does the upper look to be an MR556 and a legitimate HK upper? I also have a few more questions that I do need help with if I am going to purchase it.
Just add the .com after imgur followed with /a/sIRSxl0
1) Is the upper a true MR556 Upper?
2) will I need an HK MR556 trigger or will any AR trigger work since it has an LMT lower?
3) I eventually want to get RAL8000 and make the rifle into a 11" or 10.4" barrel sbr with an HK quadrail to make it look more like an HK416A5.
4) For the BCG can someone point me to the correct one? I can't post the link to the HKparts one that I think it is due to my new status.
The rifle is for $1400, is that a fair price despite it missing a BCG and a trigger?