For that money you could buy an upgraded NGRS second hand by KOA for example.
Or get over the fps - like banging head against a wall - TM work very well, you can always upgrade it, or buy it upgraded from somewhere like FireSupport or DCA with an M100, gear set and deans conversion, really not that spendy.
IMO other than stealth and spastic ROF I really don’t rate HPA that highly.
A decent AEG is the best assualter.
Adecent GBBR best realism and easy performance… MWS!?
BASR or HPA sniper best long range gun.
The NGRS is the cheapest to run, most reliable and consistent all year round.
The Scar, 416 and M4 are the best performing.
If you did the 3 basic mods above, that’d be 330-340 fps.
Run a G&G green and Super Nub will get you a very nice 55M with 0.28s
If you want more then up the road Rhop it to see 65M range.
If your frugal n your play style then the MWS is a very satisfying RIF to use.