Reading several posts about "mongrel" 870's, made with scavenged parts got me thinking about upgrading the wood on my 870 Express, which is in dire need of a refinish anyway, and I'm thinking a nice Wingmaster stock and forearm set with the nice checkering and grain might be nice. I've had no luck in determining if the Wingmaster "high grade" stock will fit my Express. Remington says yes (and will charge an arm + leg for the stock): Numrich says no, that the stock thru-bolt is different for the Wingmaster vs. the Express. Anybody know? Is it just a matter of getting a different stock bolt? Thanks.