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And just exactly how do you know it's doing anything for you if you weren't having wear problems in the first place?
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It works great. I highly recommend one in any piston setup regardless of visible tilt wear.
And just exactly how do you know it's doing anything for you if you weren't having wear problems in the first place?
All pistons tilt. Mechanical force is applied to the very top of the carrier's op-rod lug. Without an anti-tilt buffer, the result is rear, downward (minor and major) tilt of the carrier in all cases. The only way to eliminate the tilt would be to either use DI gas or have the piston op-rod push the carrier from the center of its mass, which would roughly be the same as the bore axis, which wouldn't work. Even if wear is not visible on the buffer tube, the carrier is still being driven downward in the rear, perhaps in some cases, not enough to cause buffer tube marring. I think many piston owners then wrongly conclude that their rifles are 'tilt free'.
The locking nub, anti-tilt style buffer prevents the rear of the carrier from tilting, even though the downward force from the op-rod still exists. The downward force is transfered into the anti-tilt buffer via the nub. The side of the round, half-inch long buffer head may then pushed downward to the buffer tube. The larger surface area on the buffer head with its chamfered edges does little to no harm to the buffer tube. The downward force of tilt still exists when using an ant-tilt buffer, the actual motion of the carrier tilt is mostly eliminated by virtue of the anti-tilt buffer head's very small gap between it and the inside of the buffer tube.