First off I want to apologize for my ignorance on the subject, I had planned on doing more research before I made a purchase but someone made me an offer I cannot refuse. I recently purchased a Bushmaster AR-15 and want to start accessorizing. I want to start slow but I would like to go ahead and get a flashlight and laser mounted. Do accessories fit all AR-15s or do I have to stick to Bushmaster made products? What do I need to buy to attach the light and laser? Mine is just the base model. Is a picatinny rail what I need? If so what kind do I get that will fit my gun? Is this what accessories such as the light and laser attach too? any other tips would be appreciated! Thanks in advance!