not sure where i would ever get a semi only receiver.... the receiver is stamped with the rest of the barrel jacket then folded and welded ..the trigger group has all the moving parts but even changing the trigger group with an only semi trigger group and welding that in place instead of the pin prolly would not be enuf to satisfy the Gov"t ..now TNW did change out the receiver with the MG34 ..a lot of work to machine a new receiver ...i think that if TNW could have made a semi only Mg42 they would have ...