2015 Shot Show: PTG M700 AR-15 Magazine Bottom Metal

got it back. Two coils of the magazine spring had to be removed to get it to feed good. It works best with moderate to fast bolt manipulation
 
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So been holding off on ordering one, wanted to wait and see some real world reviews. Im reading conflicting reports some say the reciever has to be modded, some say it doesnt. What i want to know is if once modded can it be returned to stock and function properly, or is that reciever now committed to using this system?
 
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