It will cost you $721... but IF you had to have a 45 caliber I'd get an Olympic Arms complete upper receiver for the AR platform... they have 9mm, 10mm, 40 S&W, 45 ACP uppers that work with any milspec lower.
As for the Hi-Point, ever held one of their pistols? Its like a brick! I can't imagine how much heavier the carbine would be.
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