Polarstar F2 HPA Engine for Airsoft Rifles (Model: G&G SR25)

"I've had this for a couple months now and I love this engine. It's in my lvoa and it shoots so constantly also far. I really recommend this if you can get it

"This engine is good, but I wouldn't entirely recommend it.

Pros
Efficient (Kythera is best)
Easy to use
Can be very consistent
Polarstar has awesome customer support
Closed bolt(better accuracy and trigger response)
Reduces gun weight
Enables you to use a plastic gearbox

Cons
Really expensive
Picky with buckings
Kills batteries if left plugged in
FCU connectors needed major modifications to not snap
Pretty loud
Two solenoids to break instead of one

This engine is better than the Fusion Engine since fitment and cost are better, and it doesn't need to have a QEV banjo fitting or the Amped poppet and nozzle to be efficient.
It also doesn't have all sorts of sear nonsense and semi only silliness like the Kythera, and is probably the best engine for most stuff.
That being said, I would still consider the Jack, Inferno, and Fusion Engine for other stuff, but the F2 seemed to be my best option.

"I wanted to get into the HPA world when I saw the performance that was out there for this sport. I started off by getting a wolverine inferno, and I had issues from the start. I saw that wolverine had a closed bolt systems and got my hands on the premium edition. Once again I was extremely disappointed in the performance. Customer support at wolverine didn't really have any solid advice and I was about to give up all hope.

Until Polarstar released the amazing F2! My team tech was the first to switch completely from wolverine and got his F2 first. When he put it in his Krytac PDW and I saw that he was shooting over 250ft with .36g BBs, I was sold. My whole team quickly ripped out the wolverines and put an F2 in all our primaries. I have had zero issues with the FCU or engine. I love how on the FCU I can quickly make adjustments if needed. But out of the box this thing would go through anything and keep trucking.

Sometime during my first year of game play my FCU digital read out busted. Most likely because I kept everything in the pistol grip of the M4. I had purchased another used F2 that needed some work done on it and was going to throw it in another gun. I called Polarstar to see about sending in my broken FCU and the 2nd F2. Mr. Rambo let me know he was going to be at the Ballahack Polarstar event that weekend, and I was also going to be there. I brought everything to him, he took a look at it, and fixed it right there that day! Wow the customer support! I will always run Polarstar from now on!

Thank you Polarstar for making a great product and giving great customer support. I am now running BLS .43g BBs at 400FPS making shots in tight grouping at 300ft. Barrel is r-hopped, lapped, maxx hopup unit, modify bucking. mags are PTS EPM with upgraded followers. MRS regulator. Krytac CRB shell and gearbox. Titan Lithium-ion battery.