My barrel assembly weight measurements:
16" CL: 3lbs 7.2oz
16" SS dimpled: 3lbs, 5.2oz
18" SS: 3lbs, 12.2oz
The KAC is solid for loading. The XDS-2 has a bit of flex, but I never worry about it or get the feeling that it'll give out.
For panning the XDS-2 has a bit of resistance, but nowhere near the Atlas which requires a good amount of force just to get it going (jerky). The KAC is super smooth in panning.
In tilt both the KAC and XDS-2 are super smooth and free-moving unlike the once again stiff Atlas. The KAC has excellent pan and tilt controls which can be manipulated with the weak hand while in the prone position. The XDS-2's controls aren't difficult to use if your arms are long enough to reach them.
I never felt like I was putting excessive pressure on the Atlas. It was pretty solid for loading with little flex. That was about the only thing I liked on it (aside from the QD mount and light weight).
The LW barrels only come in the 13" and 16" lengths. I just looked at the product page and was surprised to see SS versions of the LW barrels (must be new, I didn't see them before) in addition to the original CL ones.
The LW and standard-weight barrels' profiles are definitely different.
The product page doesn't say whether the LW SS barrels have 1:10 twists or 1:11.25 like the standard-weight SS barrels (not sure why they ever went with 1:11.25).
Probably because nobody wants to pay $550 for a LW barrel =P.
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