I bought the 16s first, now I want the 17. I should have bought the 17 first! IF I WAS YOU, I'd just buy the conversion kit from Hi Desert Dog, he has some on Gunbroker and available in stock on his website. It will save you some money, and you can have the best of both worlds. THEN, use that extra money to buy a SCAR 10 lower from him so you can use AR10 PMAGs.