I'm planning on buying a RPK before the end of the year i'm pretty much looking at the ROMANIAN AES10-B HEAVY BARREL from Classic Arms. The one thing i don't like is the folding stock. With that said can i replace it easily or do i need to get a new rear trunnion to accept a fixed stock? Second i was wondering what distance have you guys shot one and still able to hit a man size silhouette target with one. I'm not looking for a tack driver just something different and extremely fun to take to the range.