Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.
We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.
Your Browser is Outdated
Unfortunately, we are unable to provide an excellent shopping experience on your browser because it lacks modern functionality needed for us
to provide a fast, secure, and enjoyable experience. by MS, from OK, United States Asked on June 10, 2019
It depends on the model. The phosphate bolt is machined from 9310 nickel-chrome-molybdenum case-hardening steel. The NiB bolt is machined from Carpenter 158 chrome-nickel alloy steel. Both have a forged gas key that is coated inside and out with phosphate or EXO NiB respectively.