“Mil-Spec” is a term that refers to Military Specifications or revolution every 7”, so a bullet will rotate two full times travelling in a 14” The alternative to forging is billet, where a solid block of aluminum goes into a CNC machine. If you want to know more about barrels, I highly suggest checking out my article on AR-15 barrels. Accur81 says: September 4, 2012 at 12:34 . MIL-C-71186 (AR) M16A2 - Rifle, 5.56 mm: MIL-R-63997B (AR) Last Modified on March 4. So here’s your project, go find an AR-15 from a company you like and post it in the comments. Kit includes: Black A2 Pistol Grip; Pistol Grip Screw; Pistol Grip Lock Washer; Trigger Guard; Trigger Guard Roll Pin; Standard Trigger; Trigger Spring; Trigger Pin; Hammer; Hammer Spring; Hammer Pin; Disconnector; Disconnector Spring; Safety Selector; Selector Spring; Selector Detent; Bolt Catch Spring; Bolt Catch; Bolt Catch; Bolt Catch Roll Pin Before I get going here, I want to emphasize that just because a company lists the right spec on their sales copy, there is still a lot of room for things to go wrong. However, .223 chambers are slightly more accurate due to the tighter specs. The AUTO refers more to the weight and dimensions. The difference is very small, likely about an ounce, so it’s not worth making a buying decision over weight differences. patriot ordnance factory Standard Mil-Spec AR-15 lower parts kit. However, be advised that it is a fairly new process, and the temperatures that the barrel must be heated to are pretty high. The more important part here is the better springs and inserts, which provide a stronger “grab” on the base of the brass for positive ejection. Purchase this AR-15 collapsible stock online from 5D Tactical. key, High Pressure and Magnetic Particle Inspection of the BCG, and a shot And finally, even This site and its community are a labor of love. And exotic too. I’m not entirely sure how low of a heat you can go to soften work hardened steel. He's former military officer turned professional tech sector trainer. All Prices Are In USD. Then, they buy an AR-15 and start to get more educated. The receiver extension or “buffer tube” of a mil-spec tube is a Your rating. Not a huge difference, only about Please try again. Learn how your comment data is processed. Your options are rifle-to-rifle, carbine-to-carbine, or carbine-barrel to rifle-receiver. barrels, you will see a twist rate of 1:9”, 1:8”, and 1:7”. I don’t see commercial extensions very often anymore, and I think the industry has more or less settled on the “mil-spec” tube. I am going to limit this to .223 Rem. You know how that “teach a man to fish” saying goes? There are a lot of numbers and scary sounding words out there when related to barrel material, and we’ve done our best to simplify it: Wishlist. Oops, something went wrong. Fun Gun Reviews Present: How to I.D. That is why a lot of match rifles have clamp-on gas blocks. As a civilian, … Therefore 1:7” twist means the bullet makes 1 BCM, for example, goes out of their way to have their barrel steel certified to the spec. An F-Marked base means that the shelf of the front sight is the correct height for detachable carry handles. The only thing I can offer to this article is that chrome lining tends to be HRC 73 (Rockwell Hardness C-scale) and nitride tends to produce a surface hardness of 70-71. The length of a mil-spec AR-15/M-16 barrel is 14.5” whereas the legally required barrel length for a rifle in the USA is 16” inches. And, you won’t be obtaining one unless you have a FFL07/SOT or live in a free state where you can find a transferable rifle while also having a small fortune to spend. peened outer finish. The increased gas pressure from the carbine gas system along with an increased cyclic rate led to the development of “M4 Feed Ramps.” This style of ramp extends from the barrel extension onto the upper receiver. Both the upper and lower come from machined from forgings of 7075 aluminum. Yet others might not do it at all. Military standards of accuracy and endurance in a rifle are quite different than civilian standards, and not in the way most would expect. Related Products. 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