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It does have a feed ramp, a very polished feed ramp. I'm not exactly sure what extended ammo feed ramp is but your best bet is to contact Rock Island Armory customer service at Email: support@armscor.com or Phone: (775) 537-1444. I hope this helps!

This model uses a linked barrel which can be viewed starting at 17:00 here ---- https://www.youtube.com/watch?v=B2jvEeQWu5w