Quote Originally Posted by CarlosDJackal View Post
I have over 7,000-rounds through my LWRC 10.5-inch upper. Some of that is suppressed and over 2,000-rounds of that was in two different Carbine Courses.

The only mechanical failures I've had are:
- The buffer spring that came with the upper was faulty (Wolff Plus).
- The extractor started failing to extract.
- One of the Carrier key screws broke.

LWRC sent me a new buffer spring (which I have since relegated as a backup along with the H2 buffer - I am using an H3 buffer with a flatwire CS spring). The extractor resulted in FTEs and was replaced with no further issues.

I did not even know that the screw was busted until I decided to check the screws and the broken one kept spinning and would not tighten. LWRC shipped me a replacement Carrier overnight at no charge and I have not had any issues since.

I am awaiting the arrival of my Select-fire Transferable AR-15 and I am considering buying another LWRC upper to use on it. YMMV.
This parrallels my experience with the 16"--except the extractor hasn't failed yet . I have replaced the buffer spring that came with the rifle and staked the carrier key screws, which were not staked.