I’m wanting to pair this with a Sharps bros. “Jack9” 9mm Glock lower, other than installing the LPK, I will also order, will this be compatible to finish my build without other smithing or assembly required?

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Yes Sir. Good match

I bought the upper and lower separately, Everything looks and feels very solid and fits perfectly with the lower. No rattles, no squeaks, no play, everything fits nice and tight. Thanks for a great upper!

Does it come assembled or will I have to put it together myself?

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Comes assembled

Great experience all around. service, shipping, actual performance were excellent. definitely shopping at moriarti again.

Quality, fit, finnish, better than my more expensive ar's,hits what i aim at, would trust with my life!