Recently bought a Browning M-71. The rifle arrived via USPS with a shattered buttstock. Haven't been able to identify a source for a replacement stock. Anyone know where I can find one?

Have you tried Boyd's

You may want to check with Doug Turnbull Restorations on Monday.He does a lot of upgrades using their barreled actions

You might try this place: www.westerngunparts.com
I got a Browning lever action stock from them a few months back.

Got mine here: http://www.midwestgunworks.com/page/mgwi/ctgy/C-023