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Could be a standard mcs-t which is a great stock, I'd prefer that over the t3 beavertail for-end anyway! I'm not sure what it isi does look like a mcs-t3.I believe that's a t3 stock bud, a sendero light won't fit in an eh3 on a long action unless you trim the stock line down. It looks like there's a flare out in your pics and a flat wide fore end? Hard to tell but if so it's a t3. Nice looking rig either way, welcome to the site and good luck with your sale.