SPR MK12 MOD 1 is a 5.56, a 7.62 like pictured would be a MK11 MOD 0 except that one is set up for a OP's suppressor instead of KAC can. A RAS for one of these is going to be pretty hard to find, a few years ago there were some complete rifles for sale that KAC took as trade in's but they are very collectible since they were used in the GWOT. The USMC was upgrading their MK11's by swapping uppers with new M110K1 uppers but unfortunately the take offs have not been released. Good luck on your search.
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