The recoil spring in all semi autos is vital to the guns functionability - in a new gun its advisable to leave the bolt locked back in the safe for a month or so just to help initial cycling issues, however after a month or so leave the bolt closed as this simply wears down the tensile strength of the spring quicker and hence it will need replacing sooner.
On a Browning Gold / Silver dont lock the bolt back for any significant time as this is the most sensitive semi with regards the recoil spring and they will stop working as soon as that spring gets worn, much earlier than other makes.