Summarize this article in one sentence.
This is the first and most obvious rule. You will need to use smaller frames for guns such as regular plasma shooters and machine guns. You will use much larger handles once you’re making guns that shoot saw blades from the bottom and grenades from the top however! These dictate what kind of projectiles your gun uses. Always make sure you’re using combos that make sense. You need to find your own balance between those powerful tools that rip necromorphs to pieces, and the smaller less powerful tools that will keep them at bay. For example, it may seem like a great idea to pack two powerhouses on one gun, but that is not always the case. Two powerhouses also will mean slow shots. Use the tips to adjust exactly how your tool fires. There are hundreds of different ways you can make different tips and tools work together. The best way to figure it out is to experiment! For example, you really love that pneumatic torch but wish there was a way you  could make the fire come out in a smaller area with more power. Easy peasy: you would need to attach a compressor. You can have up to two attachments on your weapon at all times, and they alter the way your gun fires in general. You can connect a safety guard if you’re using a grenade launcher. This will prevent you from taking any splash damage if you should happen to get trigger-happy in a narrow hallway. It’s the last way that you can edit your gun. Most tools can hold up to 4, so 8 total for each of your guns. These have a variety of effects that alter the damage you do, your reload speed, ammo capacity and more. The more you begin to think about it the more you realize that in Dead Space 3 your guns really are all your own. You can make them, experiment, change a few things, and try again. Before you know it you will have your ultimate weapon combo!

Summary:
Make sure you’re using the proper frame. Concern yourself with the upper and lower tools. Pay attention to the tips for your upper and lower tool tips. Mind the attachments. Edit your gun with circuits.