Here's the price-list for this build:

AR Pistol Build


Barrel: $199.95
Rail: $156.75
Barrel Nut: $7.95
BCG: 113.96
Upper Parts Kit: $22.00
Gas Block: $70
Gas Tube: $10
Muzzle Device: already on hand
Upper Receiver: already on hand


Upper Total: $580.61


Lower Receiver: $80
Lower Parts Kit: $55
Receiver Extension: $35
Buffer And spring: already on hand
Arm Brace: $145


Lower Total: $315


Total Cost: $895.61