Yes, most registrars have their own grace periods of usually some 30 - 40 days but definitely less than 45 days (before which they are eligible to delete a renewal and ask for a refund from the registry). They do that not because they are *nice*: it's just a last resort to retain clients. But even if it enters the official, registry-level RGP (Redemption Grace Period), registrants are still able to renew their expired domains (just for some extra "recovery" fees). This is actually the reason why there is RGP in the first place.