Hi for a $300 budget you have the Hatsan Flash QE, Gamo Urban, n Umarex Guantlet. My buddy has a Maximus n Urban, both shoot well, but the Urban is way smoother.
I shoot a Flash QE, had to adjust trigger from 5lbs to 3lbs way better. They're all .22 n hit hard. My Flash was spitting CPHP's out at 950fps, so I'm guessing 26-28fpe.
IMO the Urban is legit, cocking, safety, n trigger are smooth. Where as my Flash had to break it in .The Urban's a great field carbine light n has a shrouded barrel, it's quiet.
My Flash is light as well, n has a shrouded barrel, but I put a Donny FL Ronin on it barrel length increased by 6inch no biggie, it's ultra quiet. Both rifles are very accurate n powerful. I hit a pigeon @ 102yrds today with my Flash n CPHP, square in the back he folded like a lawn chair .
My other buddy ordered a Guantlet in .22 we'll field test in a week or so. Can't give you any info on that .
Choices choices, good luck on your purchase. Keep on shooting.
Jon86