Replace, improve and upgrade your AR bolt carrier group with small BCG parts from Right to Bear. Even the smallest AR bolt carrier parts, like the extractor spring, can wear out or break. With these parts and a few simple tools, you can do the repairs yourself and save plenty of money versus hiring a gunsmith. Replacing the AR firing pin is even easier. Pull the BCG cotter pin and the bolt cam pin and the firing pin slides out.
If you need large parts, get a nickel-boron bolt carrier only. Fine-tune your AR's performance with an adjustable gas key. Shoot the lightest to the heaviest loads by adjusting the port. Upgrade your BCG to handle the load with a complete SOPMOD upgrade kit.