It gets even harder when they’ve already made up their minds about what they want and they’re really only looking you to validate it. Melonite (also called salt bath nitride, QPQ, and other names) is a surface conversion/hardening process that provides good corrosion resistance without the loss in accuracy of chrome. At least, that’s what the lore says. More information. It involves heating, quenching, and heating again. 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. I’ve indulged a little with the “just tell me what to get” crowd regarding a few things here or there. AR-10 LR308 Upper Receiver DPMS Low Profile (0) $134.99 On sale: $109.99 Out of Stock. 3.3.2.13 Receiver extension. + Newsletter+ New Content Alerts+ Deals and Sales. I don’t have any reliable data on whether or not the receiver extension material makes much difference, but all the benefits of 7075 still apply as far as strength and corrosion. This particular rifle comes with a 600m detachable carry handle and a magazine. Not many manufacturers specify their buffer tube materials. The standard AR-15 rifle uses a 20-inch (510 mm) barrel. High-pressure testing (HPT) and magnetic particle inspection (MPI) mean that the manufacturer fired a high pressure “proof load” through the barrel, then used a process to look for imperfections and weaknesses that may lead to later failure. Manufactured to milspec dimensions; This is the correct low profile c-clip for your AR. When it comes to bolt carriers, there are very few reasons you should not use an M-16 AUTO carrier. For the price of a box of ammo, you can help keep the lights on and the content flowing. Companies quickly caught on and started marketing their wares while making sure to hit the key points. Lewis Machine and Tool (LMT) wrote that Aermet is better steel for bolts, as it is 2.5 times stronger, but it’s also quite a bit more expensive and wasn’t available when the original specs came about. I’ve shot a lot of high dollar AR-15s including LaRue (another Texas company), JP Enterprises and Wilson Combat. A .223 chamber may not have enough space for the extra gas of 5.56 and could result in a catastrophic failure. I’m not entirely sure how low of a heat you can go to soften work hardened steel. I have seen one manufacturer state that the value of MPI is greatly diminished without doing the HPT first, so keep that in mind when you see only one or the other. This is one of those articles that I realize experienced people don’t really need, but the newer folks shopping for their first rifle would benefit from. Keep in mind that nearly all rear sights made today are designed to work with F-marked front sight bases. Both the upper and lower come from machined from forgings of 7075 aluminum. Visit our 22/rimfire category today and take advantage of our lightning fast shipping! I have a very similar barrel from another… Read more ». That means that the carrier is the same dimensions and weight as the original select fire design. It’s not listed for the above rifle’s specs, but BCM also uses 7075-T6 receiver extensions, otherwise known as the buffer tube. PLEASE READ THIS FIRST: Thank you for dropping by our website. The same pros and cons apply. This is a desirable feature for enthusiasts, who can purchase a number of upper receivers (often in different calibers and barrel lengths) and interchange them with the same lower receiver.” To produce a forged receiver, a large forging press presses a block of 7075 aluminum into the desired shape. The AR15/M16 rifle has become one of the most popular modern firearms on the market. An AR-15 billet upper receiver is considered the gold standard for top of the line custom builds. Our lower receivers are made with high quality materials and come in a variety of configurations to fit you perfectly. Move to the location of the pivot pin (7.500X -.250Y) and zero your DRO. I knew about the hardness for chrome lining, but not the softness of nitriding. The BDR-15-3G was the first skeletonized AR-15 that I had ever shot. 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’ve always had the mindset that teaching people how to do something was more productive in the long run than just doing it for them. This strengthens the aluminum alloy considerably. Grip this handy block in a bench vice and hold the upper receiver by the lugs or by the receiver rail. “The AR-15 upper receiver assembly is considered a part, and may be purchased and mail-ordered in most locations. Daniel Watters’s history of the 5.56 cartridge, The Enemy of Good Enough: Advocating for the MCC, Vortex Strike Eagle 5-25×56: The Raw Truth Review, Tips for Adding an Assault Pack to Your Loadout, On the Cheap: 22LR as an Awesome Long-Range Training Tool, Choosing the Best Concealed Carry Belt for You, Project Gungnir: My First Precision Bolt Gun, Go Shoot the Gun: A Defense of the Mighty .308, Manganese Phosphate Barrel Finish on entire barrel, USGI M16A4 Government Profile Barrels with, Un-notched Hammer compatible with 9mm use, Independently Certified Mil-Spec 11595E Barrel Steel 20″ USGI M16A4 Government Profile Barrel, HPT (High-Pressure Test, per Milspec) Barrel, MPI (Magnetic Particle Inspected, per Milspec) Barrel, Manganese Phosphate Barrel Finish on Entire Barrel. AR-15 carbine receiver extensions should be 1.14″ in diameter, also known as “mil-spec” in the advertising world. These solid and dependable uppers give you a great foundation for your AR15 build. The Truck Gun Light features a Mil-Spec M4 forged upper receiver and a LSA Billet lower receiver. I hope you stick around for a while, and maybe even join us. The bolt is made from Carpenter-158 tool steel. The BCM advertisement mentions staked gas carrier keys. The lighter commercial AR-15/semi auto carriers can negatively affect reliability. Armalite Upper Receivers are available at EuroOptic.com! And exotic too. It’s a good barrel. AR15 STRIPPED UPPERS. The resulting shaped hunk of metal then passes through a machining process where all of the cavities and holes are created. Order online or give us a call at 570-368-3920! There are two downsides to taper pinning, though. Where every non essential part of the upper … He's a lifelong learner, passionate outdoorsman, and steadfast supporter of firearms culture. Featuring M4 feed ramps, this upper receiver can be used with multiple calibers on the AR-15 platform. The most important part to consider when building any AR15 rifle is the complete upper receiver. The barrel bore and chamber is chrome lined. The Everyday Marksman is primarily funded by readers like you. White Label Armory AR15 Dust Cover C Clip. I know in knives… Read more », https://www.everydaymarksman.co/equipment/nitrided-barrel. Lucky Gunner did a great study in 2012 looking at the truth to all of this. You can see the difference below. The first AR build is geared toward competitive shooting. The intent is to make sure that the part will not fail you prematurely. At this moment, we are not taking new customer orders. Yet others might not do it at all. This does NOT mean that your rifle will fire fully automatic. AR-15,M4,M16 Buffer Tube Identification; AR-15,M4,M16 Mil Spec Buffer Tube Dimensions; AR-15,M4,M16 Commercial Buffer Tube Dimensions; When choosing a receiver extension tube to build a rifle there is little difference as long as you buy the same type. The M-16 specification called for feed ramps only on the barrel extension alone. SLIDE PARTS - GUIDE RODS - STRIKERS, ETC. Looking for a top quality Upper Receiver at wholesale prices? This site uses Akismet to reduce spam. In this price bracket, you really can’t go wrong with any of your options whether they are Noveske, KAC, Hodge, or one of the other top-end brands. There are various hybrid chambers out there, like .223 Wylde, that can comfortably shoot both. A tool steel extractor simply means that the extractor is better than soft pot metal. That’s where quality control standards come in, and that’s a difficult thing to market. Billet AR-15 Lower Dimensions. The temperature for that is around 950 to 1200 degrees F. Nitriding for rifle barrels happens around 750 to 1050 degrees F. It’s that overlapping area that’s cause for concern. We are currently performing some scheduled maintenance. If you want to know more about barrels, I highly suggest checking out my article on AR-15 barrels. The F-Marked and taper pinned front sight base is another indicator of quality. Again, this is the contracted military specification, but that doesn’t mean it’s necessarily the “best” option. That’s the heart of the difference. The computerized machine “sculpts” the block into a final design. One of the hardest things with writing about guns, and AR-15s especially, is that a lot of people just want to be told what to buy.