No distinctive markings on the receiver other than the serial number range to separate a carbine receiver from a rifle receiver. There were a little over 5000 M98 carbines made. Most of them were converted to the M99 carbine configuration at the arsenal by changing the stock to a longer version w/o the sling bar/ring. The handguards and sights were also changed. M98 carbines in the original as-issued configuration are scarce if not rare.

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