Thread: omark 44

If it has an original barrel it was set up to shoot the 144gr projectile in vogue at the time. More than OK to stabalise 155gr.
If it is a 44B it will have the larger diameter pin locking the bolt head. The smaller pins in the first 44 are a safety issue - a reported history of them breaking and potential for the bolt head not being retained. The pins can be fractured by dry firing.

This doesn't help with a date but gives I think a sequence of manufacture
Sportco serial numerics
I have one with DL in the serial number. The old fullbore shooters probably knew the significane of the nubers off the top of their heads