i have two LWRC's and one LWRCI piston rifles the oldest one, one of LWRC's first piston guns, it has nearly 10,000 rounds thru it, i see no wear in the buffer tube or any where else in the upper or lower, the LWRCI's M6 has about 3,000 rounds thru it, there once more, i see no wear.
just my
OPINION, but, any AR with carrier tilt is a poorly made gun.