The second generation of the Echo1 M28

Hi, i bought a m28 three years ago, and i read that so many guys with issues with it, but what that i found is the second gen of m28 is way better than before, i never had the slam fire after thousand of shots. The piston it's strong with no wear out, the sears too, the cylinder as well are durable, every thing on it is good, but the only parts i have to change was the bb stopper and the stock spring( well, not yet) and that surprise me, the part that should brake my rifle like others before, it wears out and now is shooting more slow, so im planning to upgrade with some a few extra ideas, if you have some ones please tell me