I want to get Action Army Hop up to, and Airsoft Pro doesn't have one. So i will do order from Skirm Shop. But now i dont know witch spring guide to choose. Because Skirm Shop doesn't have Airsoft Pro parts. 
For a spring guide I'd get something from AirsoftGunsEurope or AirsoftPro, they're probably reasonably priced and as strong as anything you'll find out there.
While the Action Army hop is good, I would also suggest that you take a look at the Tridos TDC setup. Gets you about AA performance, but a bit cheaper.
For other hop chambers that are pretty good, I'd look at TTI, ArchWick, and Airsoft Artistry, they're all about equal to AA with different features and advantages.
Whatever barrel should be fine as long as it is reasonably straight, which you can test on a large window or very flat synthetic or stone countertop. I suggest that you follow my lapping tutorial in my signature, for less than $30 in parts you can make a stock barrel perform as well as an EdGi if you do it right. Of course a newer barrel with a smaller diameter will yield higher power than a wider one, but if 6.03 is more widely available than 6.01 then I'd say that it's still a fine choice.
For outer barrels and receivers, I wouldn't recommend that you go buy those before you get stuff that will make your gun work well. After looking at a few EU shops, I'd say that AA is a good choice, but I'd actually recommend Novritsch more unless you really like the look of AA. Novritsch stuff is a lot cheaper, and is as good as anything else out there.
Your cylinder end piece sounds a bit short, so you may want to sand a bit off the end of your bolt handle cap until you can press it on really hard and your able to move your bolt handle relatively easily. I don't think there's really any other reason it should be coming loose, as most people don't even need Loctite.
I would try and get a Maple Leaf 2021 or 2023 bucking in 70° and up, or maybe ArchWick, CTM or Modify as those are supposed to be alright.
And as for websites, I would look at Taiwangun as even though they have that name, they're in Poland so shipping should be alright.
While the Action Army hop is good, I would also suggest that you take a look at the Tridos TDC setup. Gets you about AA performance, but a bit cheaper.
For other hop chambers that are pretty good, I'd look at TTI, ArchWick, and Airsoft Artistry, they're all about equal to AA with different features and advantages.
Whatever barrel should be fine as long as it is reasonably straight, which you can test on a large window or very flat synthetic or stone countertop. I suggest that you follow my lapping tutorial in my signature, for less than $30 in parts you can make a stock barrel perform as well as an EdGi if you do it right. Of course a newer barrel with a smaller diameter will yield higher power than a wider one, but if 6.03 is more widely available than 6.01 then I'd say that it's still a fine choice.
For outer barrels and receivers, I wouldn't recommend that you go buy those before you get stuff that will make your gun work well. After looking at a few EU shops, I'd say that AA is a good choice, but I'd actually recommend Novritsch more unless you really like the look of AA. Novritsch stuff is a lot cheaper, and is as good as anything else out there.
Your cylinder end piece sounds a bit short, so you may want to sand a bit off the end of your bolt handle cap until you can press it on really hard and your able to move your bolt handle relatively easily. I don't think there's really any other reason it should be coming loose, as most people don't even need Loctite.
I would try and get a Maple Leaf 2021 or 2023 bucking in 70° and up, or maybe ArchWick, CTM or Modify as those are supposed to be alright.
And as for websites, I would look at Taiwangun as even though they have that name, they're in Poland so shipping should be alright.
