Will a RLL work in my Rock River Arms Lower?
 

I'm looking to purchase a RLL. My AR-15 is a Rock River Arms Tactical CAR A4. Will the RLL and selective fire kit work in this gun?

I think RRA lowers have a high shelf. If it does, you can send your lower to a gunsmith or machinist and have them mill the shelf down...

Either way, if you are spending about $7,500 to $8,500 (my current estimate on the cost of these) then you can easily spend about $100 - $200 to buy a new lower that will work with the link with ease OR spend about $50 to have your lower milled and then refinished.

Get the MG first, then worry about the host!