Quoted: Chrome on the outside will wear out your upper faster.
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Sorry, not certain where ya got this info, but I believe this is total BS. Too many folks have run chrome carriers for too long for this to be true.
Take 2 rifles (FA rifles) one w/ standard BC, one w/ a chrome BC, run them till the uppers fail and betcha $100 bucks the guys running 'em give up due to the cost of replacing barrels, buying ammo, broken extractors or bolt parts long before the upper wears out......., think about it. It would take hundreds of thousands possibly millions of rounds before ya wore out an upper due to bolt carrier friction.
Add to that the fact that chrome BCs are slicker and produce less friction (especially if both rifles are frequently and properly lubed and one of the primary sellin points of havin a chrome BC) which considering this fact alone goes "directly" against the above statement as worded and you'll see why I feel this is........
Mike
ps - no flame intended BB, just it ain't so IMO.