Your plan is to buy a cheap rifle (by cheap I mean price, they actually look like a decent rifle) and then put a new barrel on it and end up costing more than you could have bought a better rifle for in the first place.
...not necessaririly;
Marlin XS7 (used) $250
Boyd's 2nds (overcut barrel channel)unfinished stock $60
Shaw prefit light mag barrel in 284 win $150
..my time..next to nothing
All in for less than $475
3/4 MOA with factory fodder