These were weighed on a Harbor Freight scale, so I would take them as approximate weights...
Model11 WSM round back, large shank action with complete bolt, accu-trigger and screws (no mag box): 834g
24in 300WSM factory barrel with plastic sights: 1189g
Mag box, follower and spring: 55g
NSS LS recoil lug: 27g
NSS LS barrel nut: 22g

I had a DNZ, flat back, short action, low, one piece base/rings that I weighed for reference: 90g

Good luck with your project


Jeff