They are totally paying, with counterfeit bills!The N.K.s are probably not paying either Kalashnikov nor Calico for the patented use of a helical magazine...as their magazine is basically upsized but similar principle...... As for the wielding... well I think it would be on par with sticking a 40mm launcher on the under of the AK barrels...so not that much different..... less difficult when you go prone; however they DO stand out pretty much.. would be more difficult to cover that big erect cylinder