Forging may produce a slightly stronger receiver due to the compression of metal grain, similar to the slightly increased strength of hammer forged barrels.īillet receivers may have tighter tolerances, leading to a better fit of components and potentially better accuracy. The computerized machine “sculpts” the block into a final design. The alternative to forging is billet, where a solid block of aluminum goes into a CNC machine. The resulting shaped hunk of metal then passes through a machining process where all of the cavities and holes are created. To produce a forged receiver, a large forging press presses a block of 7075 aluminum into the desired shape. Let’s start with the foundation: the receivers.īoth the upper and lower come from machined from forgings of 7075 aluminum. The total package comes in at a weight of 7 lbs 12 oz. This particular rifle comes with a 600m detachable carry handle and a magazine. Un-notched Hammer compatible with 9mm use.BCM® A2 Rifle stock w/ buttplate and metal trap door.Receivers Hardcoat Anodize per MIL-A-8625F, Type III, Class 2.Receivers Machined from Aluminum Forgings 7075-T6.Gas Key Hardened to USGI Specifications.Bolt machined from Mil-Spec Carpenter No.
USGI M16A4 Government Profile Barrels with 1/7 twist rate.Manganese Phosphate Barrel Finish on entire barrel.Independently Certified Mil-Spec 11595E Barrel Steel.I’ve bolded some key phrases worth remembering and grouped related AR-15 specs together. This is the advertisement for Bravo Company USA’s BCM A4 model. To start this off, let’s look at a quality example. That’s where quality control standards come in, and that’s a difficult thing to market. Companies quickly caught on and started marketing their wares while making sure to hit the key points.īefore 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. When Rob_S put out the original “chart” in the late 2000s, it became the de-facto standard for shopping around. Marketing teams are very good at throwing up smoke screens to misdirect you. If you’re new, I want to help you better interpret what it is you’re reading. In this post, I want to dig into the technical specs you should look for when shopping around.