I'm considering buying this product, in the Krinkov varient, and had 3 questions: 1 - Will/when you be stocking the new splitfire AK, and will you have it in the Krinkov variant? 2 - What is the largest capacity refillable co2 cylinder that can be screwed into this gun and still allow the stock to be fully funcitonal? Will the 7 oz. work? or is the 5 oz. the max? 3 - what barrel threads does this gun use? I've heard ir uses A-5/X-7 threads, can you ocnfirm this? Also what is the maximum outer diameter of a barrel I can put in? Thank you!