I found a ATI AT94 A2 carbine on Saturday in a LGS and put it on layaway as the price was right ($1,000 OTD). As I have been reading this model has the housing and stock attached in one piece and I was wondering if anyone has any experience if this is a pain to takedown and clean or any other difficulties. Does this require 922r compliant parts to mill out the bars preventing use of 30 round mags?