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Well I have built about 45 1903 1903A3 M1 Garands and have installed new barrel and used barrels and head spaced all with no issues. To check the head spacing is no big deal with gauges. If you...

To head space a rifle you need gauges, GO, No-Go, and possible a field gauges. Insert the gauge in the chamber, I strip the bolt so there is no interference between the gauge and bolt. The bolt...

You need to CHECK the head space every time you change the barrel or bolt.
If the barrel does not head space you may need to chamber ream barrel to achieve the correct head spacing. Or try...

Type 99's have an index mark and you need to align the barrel index mark with the receiver index mark. Once aligned you will need to head space the bolt.