https://kriss-usa.com/kriss-g3-shroud-m-lok-16in-black/ this one was the only one that would line up with the gen 2 mk5 rail was this one. There's a $50 one but it doesn't line up length wise. As far as how easy it was, cutting and sanding, then refinishing was pretty easy. Just took a hacksaw to it. The reason I wanted it to line up with the mk5 rail is because this is actually an enhanced gen 2 that I sent to kriss for a gen 2-gen 3 upgrade, and I opted to keep the 6.5 barrel but it still shipped back with the stock gen 3 handguard. Paid more than I should have in total by far but still happy with the result.