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Why would you buy this? Well, its very heavy, and costs many times what a normal chalking gun would, but on the other hand it delivers a constant rate of flow and that saves a lot of time and effort when you are trying to finish a job to a high standard.
Having said that, in some ways this product has a very limited appeal. If you are a professional you probably don't need it because you have the skills which makes it redundant, and unless you do a lot of DIY you can't really justify the cost.
I bought this caulking gun as part of a set that was offered at a deep discount. I didn't expect to find it useful but it has been a pleasant surprise. Given I'm not a tradesman I've used this chalking gun quite a lot (I would estimate over 40 cartridges over 4 years) and it is still going strong.
The controls are easy, a large dial on the side to set the rate of flow, and the trigger to activate it. In practice you will probably find you change speeds very infrequently.
The biggest disadvantage is the gun's weight. With a battery, it comes in at about 2 kg (plus the weight of the cartridge). I find that the weight of this product is offset by the fact that you do not have to use your hand to squeeze the silicon out of the cartridge.
I have had 2 occasions where the plunger slid the end of the cartridge out of the way and the gun ended up with silicon all over the place. Cleaning it was annoying, but taking the main parts out to clean was not difficult.
Ryobi offers two types of battery for this unit, and I have the more basic NiCad type. I have not had an occasion where I used this unit so much I've depleted the charge in a single day (having used it for 4 entire cartridges over a number of hours). So all in all it has proved very useful.
"CCG-1801M Caulking Gun Durable gears and carriage frame help ensure tool longevity Variable speed adjustment lever for flow control Easy release manual push rod for quick reloading On-board puncture tool to break tube seal if needed Switch lock helps prevent accidental start-ups 200 + tubes of latex per charged battery Over 225Kg of push force to handle the higher viscosity materials No load speeds: High 5.5mm/s Low 1mm/s Max output force 239Kg Soft grip overmould for improved grip and re"