I just picked up a Type 99 from someone who brought it from Ohio Ordnance and it has been converted to 7.62/.308 with three different main serial numbers among the three major components.
The upper receiver has serial # 13065, Kokura Hitachi in April 1944
The barrel is Serial # 3108, made in Dec, 1941
The lower receiver and the bolt carrier group have the same serial # of 9343
The rest of the components like the charging handle, dust cover, bolt carrier locking block, and scope all have different serial numbers.
Is this common or rare for a mix party like this one ? It also has this marking on the receiver "HR Guns, P C FL" . Is it an import mark ?
Pictures https://postimg.cc/gallery/ms4qFHxF