Best to let a gunsmith do it.
Best left to a gunsmith
It needs to be re-fitted by a qualified Gunsmith. There is no simple way to do this.
according to Browning Service and a local gunsmith - YES
No
No
Depends on what you mean by "tighten up the stock", the exact configuration, model and maker. Depends on what you mean by "tighten up the stock", the exact configuration, model and maker.
Requires appraisal
Contact Browning.
No
Check Browning's website.
Contact Browning