I say SBR... Think "Constructive Intent"
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How is it a rifle without rifiling grooves?
How is it a rifle without rifiling grooves?
How is it a rifle without rifiling grooves?

Right, but I think the kit will get pushed out if the way by the hammer before the hammer hits the firing pin. Without the chamber the kit will probably not be aligned perfectly. Too far forward or too far back and the hammer pushes the whole thing forward without ever contacting the firing pin.