Hi. I bought a kraken and I want to upgrade it. I'm not sure what I should do with it but I have some ideas.(AK-74 or something like that. I saw the Kbs Beryl. A polish assault rifle and it looks like it would be cool for airsoft. I just need to do a lot of upgrades and I'm not sure if I can get a top cover with a rail for the AK. Please reply if you have any ideas.