If you wish to look at how to build an AR-7 Firearm, then you can approach a gunsmith. But we would also suggest you buy the weapon. It is priced at USD 250, and yes, it’s cheap. The level of reliability has increased. The spare magazines cost about $17, and it is the only negative in this gun. The design has no flaws and is fun to shoot. You can find a wide range of accessories to add. The recoil is low, but the weapon has been a great resource.