Trx 2.5 Vs Ofna .25
The rebuild is around $80 or better I believe. You can buy sirio internals and put it in your 2.5 and get more power. But from what I am told it will not put out as much power as a sirio .18. Ohh and the sirio internals are over $100 because you have to get the crank, rod, piston, sleve. The sirio sells for $185- $200. i AM TOLD THAT IS THE WAY TO GO.