Also, feel free to hit my character up if you need something to keep you tooted and driving fast.

Going more on what Nutterbutter was talking about, you should be able to make modifications to your weapons such as: chopping off barrels, chopping off the stocks, etc. This would make concealing weapons much more realistic than the "GTA: AK47 and rocketlauncher in the butt" method of hiding weapons in games. Weapon modding would go hand in hand with a gunsmith skill. If your skill is not high enough you might end up breaking your gun or just making a terrible cut so it looks worse.