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The GMM surprised me at 3 MOA with 3 of the 5 holes touching in a straight line. 2 flyers but that was me. A little more work and I should have that spread a little tighter but for what I'll use it for it's great grouping. I'm leaning toward the enlargement of the gas port because like you...

Sounds like an H buffer which is 3.8oz if my research is good. I'm still researching the change to another buffer which may cause short stroking if I don't chose the correct weight. I already have short stroking with the 7.62 ammo so I may have to accept the fact that this gun is made for .308...

I've been hoping to get to that point of less picky and one of the next steps for non-destructive improvement would be the buffer. I'll have to weigh mine since I haven't yet. I like the "Big Smith" comment. I'm going to use it myself now. I'll be at the range tomorrow and using Gold Medal...

Also thanks for the link to your thread. It helped a bunch!

.308 pressure Mistwolf. I guess I made an assumption that everyone here would know that .308 is a higher pressure,thus, it would cycle the bolt better with less fail to feed due to short stroking problems. At least that is my experience with my M&P 10 and seems to be a common problem. I'm...

M&P 10 failure to feed I'm new here but have used info so much I decided to join. I have a Smith M&P 10 also with many of the same problems listed here in this thread. I've added one Tubb's Precision AR-10 CS Buffer spring, a CMC 3.5 pound trigger group, and a 3-12 UTG scope. The trigger is...