oh and I just remembered, even though it's been discontinued, smith and wesson used to make upper halves in 5.45. CDNN had them for a long time fore a fairly decent price but I didn't jump on the 5.45 train until S&W gave up on them, you may find them around gunchoker or armslist if you look hard enough.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
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