The only additional expense for you will be the purchase of a lower receiver, which is not included in this kit. We guarantee the high quality of the goods. All parts are made in the USA and meet all accepted international standards.They pass a fired test before they go on sale. Let us take a closer look at the composition of this AR-15 tool kit. It includes a nitride-coated stainless M4 profile. This is a premium series with a steel gas block. This barrel is already equipped with a forward assist and dust cover. Inside the set you will also find a reliable black anodized charging handle. It is ideal for accurate and aimed shooting. The rest of the parts included in the kit will be useful for assembling your pistol. There is a hard coat anodized upper receiver, muzzle brake and others. Please note that AR tool kits come unassembled. You can choose the assembly option when ordering. There are kits for both M-lock and quadrail in our store.