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Adding them to the cart at Impact Weapon Components has been the best pricing I’ve seen lately. 220 bucks for a DF model.

If you’re using the M600DF, your only options at the moment are the factory body or the Modlite 18650 body. The Modlite body mandates that you use the rechargeable cells. The factory body allows you to use the rechargeable battery or the 123A batteries at a reduced output level. Modlite sells KeepPower 18650 cells which top shelf quality. You’ll want their 3,500mAh rated batteries. The NiteCore D2 charger is awesome. It gives you a lot of data about the condition of the battery. They’re inexpensive too. I have several 500 lumen Surefire M600C lamps which run on 123A’s. They’re output is decent. The M600IB is a step above the C with the auto gain benefits which help a lot indoors. Now the M600DF is several magnitudes above both in terms of flood output. I’m probably going to swap over to a DF on my AR15 and leave the IB on the Benelli.

Highly recommend you go thru my guide on how to replace that receiver extension. It’s not an easy task. If you are going to attempt it, hit me up if you get stuck. I’ve walked a few users thru it and I don’t think I called anyone names! Those tubes do have a black grease inside, so if you checked its oil, you’ll likely get some on your finger. The tube is steel, so anodizing won’t work. Some cold blue may cover up some of the marks. Steve Rose at Rose Action Sports can thread the muzzle of your shotgun if you really want that choke.