Originally Posted by
gotm4
Playing Devils Advocate:
Totally understand wanting the F marked FSB.
Have you ever experienced a problem w/rifle feed ramps? I haven't ever had a failure to feed that wasn't attributed to a bad magazine or improperly adjusted or worn/broken mag catch.
Have you ever or do you ever shoot enough to even see the difference in a 4150 barrel vs. a non-4150? , I shoot a boat load and have never noticed a difference between 4140, 4150, non chrome-lining and stainless bbls other than the stainless & non chrome-lined bbls being more accurate generally. There are better barrels as in the HK416. The Noveske 17-4 is also an excellent barrel, but again I probably don't shoot well enough fast enough to ever see the difference. :)
How many AR bolts have you broken in your shooting history? I've broken 7 since 1975, 3 were MP tested Colt bolts in carbines. I've never had one fail in a 20" gun. All bolts break in AR direct impingment carbines with enough rounds through them. If you haven't broken one yet you need to shoot some more and report back. ;)