I sold my MAK90 not long ago because 1) I picked up an SLR-107F for a great price on here and 2) the unthreaded muzzle bothered me lol. I have the Arsenal and a Rommy Draco atm but honestly I'm not a huge AK guy, I like them but rarely shoot em.
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Depending on the specifics, $600-700 is a good deal (straight cut receiver is worth more than a slant cut that requires special furniture from Ironwood for example). My only complaint about the MAK90 is that typically the muzzles aren't threaded, otherwise great AKs.
Assembled my PA10 lower and attached the upper a couple weeks ago and have it lubed and scoped now. I'm hoping to make it to the range this week to sight in, so far I'm extremely pleased with everything about mine. Paid $130 for the lower and bought the rifle kit for $699 a few weeks before...