Inland flat bolt usage?

[Johnny in Texas]

When did Inland stop using the flat bolt? What s/n range or month?

thanks

[Tuna]

About March 1944 around the 5 million range.

[Mike in NC]

I have a 4.963 million Inland with a 1-44 barrel. That was getting close to the end of the flat bolt.

[Matt K.]

I have a 5 million (I'm at work and I don't have the SN memorized) with a 3-44 barrel. It has a flat bolt and a flip sight.