Don't need a borescope. Just uncover the muzzle, wipe it clean and you can easily see how many lands there are. You can stick the grease back on.Can't tell yet. I'm tied up tonight, but I can try and dig out the end enough to get a borescope in to tell - maybe tomorrow. Found the original listing from when I bought it on CMP:
"NOS. I do not know if 2 or 4 groove. TOO greasy and cosmo packed."

WAKE UP People!! One guy just lost $550!! If you get a PHONE Text from someone claiming to be a SELLER, Do NOT SEND MONEY!! NEVER put your phone number in ANY post. Scammers pretend to be Sellers! Contact Real Seller via PM. NEVER EVER send a penny without a VOICE phone call with seller and demand custom photos.