Quote Originally Posted by Failure2Stop View Post
Our 5.56 (E3) bolts are pretty different than anything else out there in the 5.56 world. Rounded lugs for reduced stress risers in the bolt, reduced cam pin hole for a stronger web, repositioned extractor pivot position for better mechanical advantage on the extractor, and more reinforcement on the lugs beside the extractor. 20k bolt life on short barrel suppressed guns (yeah, springs still need to be changed at their normal intervals).

The SR-25 and the MWS bolt carriers were very similar, but then both took diverging but similar paths. The lug dimensions are close enough to at least be nominally cross-compatible. LMT does good stuff, I hold Carl and his crew in high regard.
You have a representative of KAC publicly endorsing a 20k round life with the bolts. It's a lifecycle that the company advertises and employees are on record endorsing.

It's not in their blanket warranty policy, but it is aggressively marketed as a key feature and is recycled in the industry as fact with their products.

So you're correct with the published warranty, and users who repeat the official statements of KAC employees are correct in assuming said public statements are made with a significant data pool of end users to support it.