as mentioned, the standard is .278. raising the link (longer) would improve the slide/barrel lug overlap (increase it) and improve accuracy. commercial guns run about 60-70% overlap. 100% would be the most accurate but likely cause the slide to rub the barrel and would definately alter the rear barrel face angle.
the angle can be adjusted as well as the feed ramp, so, no biggie there.
you can do hit or miss with different sized links and see how the gun runs and what happens to accuracy. (that's how i do it
) or you can measure the overlap by lining the lug slots with clay and cycling the gun.
anything above 50% overlap is acceptable for average use (non-competition).
it's actually easier to do it than it is to explain it.
