From the manual:
2. To replace stock:
Insert magazine box into receiver, open end to the rear and notched end first. Place barreled action
assembly carefully into stock. Be certain trigger guard is seated properly in stock. The longer
takedown screw goes behind the trigger guard.
Tighten the two takedown screws alternately until both are snug, then tighten front screw Firmly;
finally, tighten rear screw.