I have placed an order for a Rock River Arms ATH. I ordered via Class 3 weapons in Houston TX. Great service! I have loaded approx. 2000 rounds of ammo for it and have a Mark 4 3.5-10X40 ready to install. I will need to purchase some spare magazines. I am relying on the vast experience and knowledge here on the 'hide for suggestions on what magazines will operate better and be more durable. Thanks in advance for your input.