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besides the AX556 lower, none. Many accounts of guys running VLTOR A5 in combo with LMT BCG (including bolt) and having success, including with BCM middies (14.5 & 16).... Also reports of guys using the SLR & Syrac adjustable gas blocks with a lot of success.... ELW-F barrels have been reported to have good accuracy, especially when used with KMR which allows for perfect barrel nut torque. In theory it should work well, I have stock DD rifles so I'm at the stage in the game where I want to build & tinker....
I could also just buy a SR-15 upper and call it a day, however no Mod 2 uppers available for currently and probably not an time soon, especially in 11.5 & 14.5 lengths... Of course if my builds run well then I'll have that added sense of pride that I built them, so there is that as well. YMMV
Okay so if I go with the regular sr15 16" and have Marvin cut it to 14.5 and dimple the barrel what am I losing and what am I gaining compared to the normal 14.5 with dimpled barrel?
Just be careful with taking other guy's experiences with certain combinations at face value and assuming you'll have the same experience, especially with different variables mixed in. If you get into a bind after it's completed it'd make for a really difficult time finding where the issues are stemming from.
Otherwise that's about as cutting edge of a parts list as you could have. But forget about the SR-15 Mod 2 upper, for that kind of dough for three builds you could get a complete Mod 2. Or 2, or 3.
It's the same exact rifle except the orginial has a heavy contour barrel dimpled. Yours will have a skinny contour barrel dimpled. Yours will actually be lighter in weight.
Nothing else really differs. Gas port size may vary slightly but it's almost not worth mentioning.
I'll also add that while it might be slightly more bad ass, it will cost like $800 and basically add no real tangible benefit to the orinial configuration. If you want a 14.5" barrel. Ok but I don't really see the point in dimpling that skinny contour barrel.
Unless you are going to get a piston upper, and while that is not "better" it is just "different" I doubt you will get much more out of it.
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