I bought the 10 oz. gun awhile ago and like it so much I bought this larger one. You can get a conversion kit, but, being a professional remodeler, time is money. I can have both guns loaded with two different products. I'm finishing off a basement right now, so I bought this gun to run drywall adhesive while hanging the board. The holder for the tube is metal, so right out of the box this gun is heavy. Add the caulk, and you really know you're holding something! It's not bad once you're operating it because you'll normally use two hands anyway. The flow is adjustable, so you can crank up the speed and lay the gun down in short order, so the weight won't bother you for long! I would recommend this to anyone with a weak grip or someone who runs a lot of caulk. It comes with one compact battery and a charger.