I picked this trigger up from another member for $25 (Thanks Ray!). In his post he explicitly inform the potential buyer that this particular trigger has malfunctioned numerous times in his lower. I bought it as is, eventhough Ray expressed sincere interest in refunded my money if I can not get the trigger to work. Deals a deal!
My other option is to put it in a Camo-coated Cav Arms Lower. Sonce I can not switch uppers, this is a dedicated lower. Plus the polymer may be more forgiving.