It’s becoming easier than ever to find specialty roll marks or laser engraved lower receivers that feature cool looking, culturally relevant, or humorous elements. There’s four ways manufacturers go about making lower receivers, and each way will contribute to the characteristics of the lower as well as the price.Ĭompanies generally want to show off their logos and will feature them prominently on a lower’s roll marks, stamped or etched into the magazine well of the lower.
The cost difference is pretty minimal, though, so why not have the peace of mind of MIL SPEC? It’s a little more expensive because it is harder on the CNC machines and the tools involved in making them. That being said, 7075-T6 is almost twice as strong. It is more affordable, more corrosion resistant, and it’ll do the job just fine. The aluminum alloy 6061-T6 is not MIL SPEC, but don’t let anyone tell you that it isn’t good enough for your next rifle. Lower receivers will be made from either 6061-T6 or 7075-T6 aluminum, and the differences pretty much boil down to two things: strength, and resistance to corrosion. When you’re buying your receiver, it will specify exactly what alloy was used in construction, as well as the method by which the lower was made. This lightweight yet strong alloy contributes to the versatility of the platform.
The AR-15 lower receiver is constructed from the same aluminum alloys found in everything from the car you drive to aircraft and even fishing reels.
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