This option installs a Romanian-style side rail by riveting it to the M72 receiver. Please note the Romanian rail is not compatible with the M72 rear trunnion — it cannot be riveted there — so the rail will be riveted directly to the receiver, which is a common and accepted method used by many builders.
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M72B1 Side Rail
Nice option to have, but mine was exceeding tight when I tried to install scope mount. Also position of sling mount on receiver almost interferes with rail.