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can anyone please tell me if i need to get a new gas tube and what kind? or can anyone recommend a quad rail for a saiga 7.62

im thinking about getting a quad rail for my s7.62 and have to get a lower handguard retainer and a new gas tube to pull it off right. Will any gas tube be ok or does it have to be a certain one? im thinking about getting the strikeforce package what do people think of those are they worth it? http://www.amazon.com/Advanced-Technology-AKA-2300-Package-Buttpad/dp/B001AWREOM/ref=sr_1_16?ie=UTF8&qid=1301683501&sr=8-16

thank you so much ive found the lower handguard retainer but i cant find the AKM gas tube do you know where to get one? and im not going to put optics on the quad rail im getting a side mount double rail for optics.

so i want to put a pistol grip and a quad rail system on my saiga does any body have any suggestions on good rail systems. i found this one but does it fit saiga's does anybody know? http://www.amazon.co...01639175&sr=8-7