Interesting conversation.
I can understand everyone's beef/frustration here. I do have a bone to pick with FX. But let me say I really like the Impact and the potential that it brings to the field.
Having said that I find it very frustrating that FX makes changes and doesn't mention it. I understand that they are continually trying to improve things so that's good; but it winds up some of us are not getting what "the YouTube guys" are getting and we wonder why.
Take for instance their MK2 Impact w/PP. The first few that were manufactured HAD the 57 mm HS. Then they went to the shorter less powerful spring because it was too difficult getting the speed slowed down into the sub 900 fps range where JSB MKII pellets like to live. OK, I get that but if you're going for more power with the PP isn't the likelihood you'll be shooting slugs where you want that extra speed? Couldn't FX simply toss a 57 mm spring in the box for that vary reason. Those springs, in the amount FX buys them at, shouldn't cost the company more than a few cents each. But now I have to order one and pay for shipping and wait several days if I want to explore the full potential. Very frustrating, indeed. Toss in a spring and watch their Customer Service phone call drop substantially, so FX wins as well!
My Kalibrgun Cricket included a second, less powerful spring in the box....I've never used it but it's cool they thought to do that.
Another example.......I have a Gen.1 Impact that I recently rebuilt. The older Ernest Disassembly Video shows him loosening the tiny grub screw on the hammer stop with a 1mm allen. That's a near impossible size to find in the US. So I ordered it from England and with shipping paid over 13 bucks. And guess what, it didn't fit.......they changed the grub screw on the later Gen.1's to 0.9 mm.. A 0.9 mm IS easy to find in this country; I got a Wiha set for 3 bucks on Amazon.
FX needs to post some kind of spec sheet on their FAQ area with these kind of changes...I mean they do want us to work on our own guns with the Masterclass releases, right?
I don't know if my new MK2 will acheive the 920+ velocities I'm going to want. I'm having a clipping issue so shots are going all over the place. Once I get that resolved I'll get onto tuning. Meantime the rebuilt Gen.1 is shooting JSB Heavies at 870 fps, Lights Out! Tack Driver!