Just wanted to throw this out as food for thought. What does mil-spec mean for the AR-15? Mil-spec is a Military Specification set at the time a piece of equipment was developed and adopted. So what does this mean for the AR-15 and its parts? Well the bolt in an AR-15 uses a design from the 1930's (nothing wrong with that I have a 1911, they have been around for over 100 years). The bolt is built to 1950's standards and methods with some 1960's improvements. The AR-15 rifle and bolt are the result of the knowledge and steel from the 1950's. It you go out to buy a new or new to you car do you look for a car from the 1950's or do you want something newer because it is better and stronger? Mil-spec is not the end all solve all. There are companies who make excellent AR's that are not mil-spec, they are better and stronger than mil-spec. You may ask why the government does not change and use the new metal or metallurgy. Time and money, and if it isn’t broke don't fix it. There is more to it and if you really want to know you can research it out, it is frustrating and mind numbing why they will not change. To call something mil-spec it has to be made to the military specification. If you make a part (or rifle) that’s constructed of better material using newer technology than when the AR-15 was adopted, you can not call it mil-spec even though it is better than the current mil-spec. Mil-spec is not the best but can give you a direction to go. The Military replacement schedule for an AR-15 bolt is 7,500 rounds. Most of you have read articles of AR’s shooting more rounds than that before any failure or none at all. Now granted the Military wants to replace something before it breaks, who wouldn’t I surly do. I check several different parts on my AR twice a year and make sure they are in good condition and not close to replacement time. Do your research, call the company and ask questions about their manufacturing and metallurgy processes and knowledge. Just saying your product is mil-spec is not good enough. Your barrel and bolt have to be High Pressure Tested (proof loads shot in them) and Magnetic Particle Inspected to truly be mil-spec. I would love to own a high end AR and would not think twice about buying one if I could afford it. Since I can not I will stick with those I can afford while making sure they are to MY standards. Just because someone else said it is good enough for them does not mean it is good enough for me. I owned a Kimber 1911 and would not buy another. Are the bad guns NO, certainly not they are accurate and function if you keep them clean. I use to shoot ISPC pistol matches and if I did not clean my 1911 between matches, half way through the next match it would have issues that were always solved with a cleaning. My Colt/John M Browning 1911 does not have such issues and is more accurate than I am. My Colt 1911 gives me the extra bit I want when choosing a hand gun for Dynamic reasons. Well I have gone on longer than I intended. It’s time to get some gun work done.