Saw a pic of a really nice short barreled conversion of a 12 ga. Siaga by Tromix last night which got me thinking about doing the same (looked like a Galil MAR). I've never really looked into them so I 'm wondering whats the word on Siagas - decent guns? Any major issues with them? How expensive and available are the mags? Anyone know where to get one, or the going rate on them?