I voted for the Hammer, mainly because that is what I have experience with. Another option and one that is probably easier to find at the local store is the Lapco Bigshot.

At the moment I only have the one fin for my Hammerhead (ordering the full kit soon) and if I don't have a good paint fit the Hammer comes off and the Bigshot goes on. Fantastic barrel and very forgiving of paint match. Smoothest bore I ever saw. It is even difficult to look through at direct light. Very wierd effect.

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