Hi
@Varsani17
Welcome to the site.
Regarding the Icing Gun, these are more so used for making biscuits and sometimes have nozzles for piping with them. You can also get Icing syringes, but to be honest, a piping bag and nozzle are much better.
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If you mean a sugarcraft gun please see further down the post.
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I have mixed feelings on an Icing Gun because I know people that have had issues with them in the past, and depending on what kind of business your friend wishes to start, it may not be the best tool for you to buy her.
If she's making biscuits all the time and she gets the consistency of the mix correct, then the icing guns can make beautiful pretty biscuits. They also have piping nozzles that come with them, but I know that people have found that with the buttercream being much thinner, it's just oozed out, causing issues with what they were trying to decorate.
An icing gun is quite a specific thing and generally only used seasonally for Christmas Cookies, so it might not be something she would use a lot.
If your friend makes lots of cakes/cupcakes, there are lots of nozzles (the new Russian Piping Nozzles are great for effect), moulds, paints, etc., on the market. You could even buy embossed rolling pins with patterns on them, so if she was to make a biscuit, she could easily use the embosser for both cakes and biscuits.
If you still wish to go ahead with the Icing Gun, make sure you read reviews and see how other people found the product.
If you mean a Sugarcraft Gun like this? Then yes, these are a good tool and come in very handy when making decorations for cakes/cupcakes.
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I hope this answers your question, but if you need anything else, then please let me know.
Best wishes
Angie