Depends on location mostly. T99 in as described condition is worth round $250-$350 in most places. Some might ask $500. This is really the hard part and is based on location more than anything. Were is the rifle located?
Dust cover=$50. Leather sling=$75-$100 Bayonets are around $125 but variations can go up to $1800. Common late war bayonets can fetch $200.
So, what state is it located in? and any chance to post pics?
I own firearms not to fight against my government, but to ensure I will not have to.