skruface

Sorry to raise a long-dead thread, but I PM'd the original poster and got no reply. I am wondering if the threading on the MUR upper is the proprietary G&P threading (meaning it can only use G&P front ends without modifications), or the more common TM/King Arms/G&G/Madbull threading? I am asking because i would like to use the MUR upper on a G&P VLTOR lower, and attach a Madbull JP Rifles long front end. The Madbull front end doesn't fit on the normal G&P rcecievers due to this difference in threading. And before someone mentions it, yes, I am aware that Madbull