This has probably been discussed before, and I know there is a DIY flat-hop article, but I was looking on evike https://www.evike.com/search/?search_in_description=1&sort=3a&keywords=Flat+hop&x=0&y=0 and there were some flat hop options. I have an ASG Aug A1 Proline that I want to flat hop and put a 604mm barrel in. I'm assuming I can do this myself, but on the first option https://www.evike.com/products/47834/ there are options for hard and soft. I'm assuming this has to do with the FPS of the AEG, my Aug is shooting 400fps. What would you recommend for this upgrade?