Having built HPA QB's with excellent results in day's gone by I jumped on this low cost (everyone remember when an airgun regulator cost $600 and you had possibly 2 choices of custom tuners?) QB evolution. Original Gen1 .177, cock's smooth and light, 6oz trigger, did swap an 1,100psi Ninja pro reg I had around on it along with a modified QB78 stock and a strip of Black electrical tape -never cared for lot's of writing on rifles- . No POI shift ever and shoots Nickle size groups at 55 yards off my new which is a well as I shoot and hasnt needed even an oring yet. Glanced t PA and $224 for the .25 seems a true value!