I don't have specific number, but I believe it adds several hundred fps, along with pushing it farther with more accuracy. I have always liked the 9MM round, it doesn't have that slap in the face the .45 has and I can fire off 2-3 rounds for every 1 of .45. 9MM is also alot more cost effective and since I already own a pistol in 9MM, the 9MM carbine seemed a natural. A few weeks back, Ghost and I were at his range and there was a guy there from Kel Tec, that had the sub 2000 in .40 S&W with red dot scope. He let me shoot it and it shoots pretty nicely, had a lot less kick than the .40S&W CZ's and was very accurate. After doing my research, the Hi point, while it is kinda ugly, seemed to be built sturdier and had few issues overall. I hear the Kel Tec has FTF issues and the only issue I have found in my research with Hi point was with the aftermarket 15 rd mags having feed issues. I was at the gun show last weekend and had the chance to hold both and its obvious which choice I made. The only issue I have is that it has a bit of surface rust and some scratches, which I didn't really notice until I got home. Kind of unnerving when buying a supposedly NIB rifle!
I sent pics to company I bought from and we'll see what happens.....In the meantime, hoping to go shooting again next weekend...