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Differences between AR9, .308 and AR-15 80 Percent Lowers

With so many calibers available in the 80 percent lower market, we figured it’s appropriate to properly break down all your available options. Ready to build a badass SBR? What about a featherweight AR pistol? Maybe you’re interested in a rugged, mil-spec AR-15 chambered in good ole’ 5.56. Here are all the differences between the AR8, .308, and AR-15 80 percent lowers!

#1: The AR-15 80 Percent Lower

Ah, the O.G. 80 percent lower. This is the lower that started it all – and it’s the most popular by miles for that reason. Simply put, if you want to build a standard AR-15 from scratch and spend the least amount of money as possible doing it, you’re in the right place.

AR-15 80 percent lowers come in a few configurations: Billet, forged, and coated or raw. Billet lowers are made from 6061 T6 aluminum and they’re the crowd favorite because they’re a little easier to machine. Forged lowers are crafted with 7075 T6 aluminum and they’re favored by those who love all things mil-spec.

Raw lowers come with no coating whatsoever, allowing you to apply your own paint, powdercoat, anodizing, or water transfer finish (and they cost less!). AR-15 80 percent lowers are compatible with all AR-15 parts, uppers, and internals available on the market.

#2: The AR-9 80 Percent Lower

We’re excited to bring the new AR-9 80 percent lower to market! Recently introduced, this 80 percent lower comes chambered in 9mm, and it’s compatible with all Glock magazines! Unlike AR-15 lowers that have been converted to accept 9MM, our design is proprietary.

Available in forged and billet, our AR-8 80 percent lower features an integrated trigger guard, competition-style feed ramps, and a unique, lightweight design with a broached mag well. The AR-9 80 percent lower is compatible with nearly all available 80% Lower Jigs, too! Most standard AR-15 upper and lower components are not compatible with the AR-9, though we have all parts kits and uppers you need!

#3: DPMS Gen 1 .308 80 Percent Lower

Notice we don’t call this one an AR-10 lower – because technically, it isn’t. Our DPMS Gen 1 .308 80 percent lower is built upon DPMS’s own variation of the AR-10 platform. Many of the original ArmaLite-10 platform’s components are not compatible with the DPMS Gen 1 lower, though DPMS has created a considerably large “AR-10” market with their own platform.

And yes, of course, we sell all the Gen 1 .308 components you need, including uppers, parts kits, buttstocks, buffer tubes, springs, and accessories. The DPMS Gen 1 .308 80 percent lower is also compatible with most (if not all) 80% Lower Jigs, so any compatibility concerns should be of no concern.

The DPMS Gen 1 lower is also available in forged, billet, coated, and raw configurations.

Pick it up with an 80% Lower and 80% Jig Combo, save a little cash, and get to building!

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80Lower Jigs, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.


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