Guys,
I have an LMT MRP with both 14.5 inch and 10.5 inch barrels. I have run about 2000 to 2500 rounds through this rifle (mostly in the 14.5 inch) without any problems or malfunctions whatsoever. I recently changed the Smith Vortex flash hiders that I have on both barrels to the PWS FSC 556. I have run the FSC 556 on the 14.5 inch for a while and have had no problems with it. Today, I went to the range with the 10.5 inch barrel with the FSC 556 for the first time. From the very first shot fired, I had double feeds and also failures to eject. Again, I had no problems with the 10.5 inch when it had the Smith Vortex on it. I tried multiple magazines by multiple manufacturers (PMag's, Lancer's and Tango Downs) and they all had the same effect, even with different ammunition. My question is, would the FSC 556 be causing the problems? They only thing that I could think of would be that the FSC 556 is not allowing enough back pressure to cycle the gun properly? I haven't had much experience with SBR's and this is my first. Being that this is the only change that I have made, this is the only thing that I can thing of. I bet the 10.5 hasn't had 500 rounds through it, I have a dedicated bolt and carrier just for the 10.5 inch and I have been using the stock LMT buffer which is I believe an H. I swapped back to the Vortex on the 10.5 inch when I got home, I just haven't been back to the range yet. Do I need to run an H2 buffer if I plan on using the FSC 556 on the 10.5? Any help or info would be greatly appreciated.
Thanks,
Ben


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