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octagonal https://www.acutefirearms.com/products/handguns-radical-firearms-fp105556m410-816903025107-2889
Its mostly rounded but there are slight bends to separate the different M-lok positions. There are more pictures available on radical firearms website. https://www.radicalfirearms.com/product-p/fp10.5-5.56m4-10fcr.htm
This isn't the correct handguard that comes with it. The link Paul provided shows a different handguard it's a clamp on style but that should be the one you get. I bought this exact pistol and the handguard wasn't this one buds shows but the one Paul shared a link to. I'd imagine the manufacturers picture would be correct for the same UPC and model number so this isn't an accurate photo. Hope this helps.
Great pistol though, very accurate and reliable. Only complaint would be the finish of the firearm, very dull and easily scratched. Almost like a phosphate bcg if you've seen one. But other than that I really like mine.
Dominic, Radical Firearms Customer Service should be able to provide accurate information at 281-207-8788 or by online inquiry here : https://www.radicalfirearms.com/Contact_Us_a/83.htm
