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80% Lower Receiver: Buyer's Guide When deciding on a 80% lower to start a construct, there is an excessive range of alternatives out there and the advantages of one over the other are not readily apparent, or are shrouded in marketing terms so as to appear much better than the rest. Material. The three popular alternatives today are 6061-T6, 7075-T6, and strengthened polymer. When it comes to general strength, 7075 beats out https://80-percent-lower.com/ with 60% higher tensile strength and fatigue strength, and 50% higher shear strength. This greater strength results from a greater firmness, which in turn leads to 7075 being more susceptible to fracturing upon sharp impacts than 6061. Likewise, keep in mind that 6061 is going to be considerably easier to machine due to it being softer than 7075. Then along comes polymer. Certainly a puny runt when compared to the aluminum alloys, why even enter as a contender? Due to the fact that thinking about the stresses that the regular use of an AR places on a lower, we see that the polymer is more than enough while using an incredibly light-weight option. Not to mention, it makers like butter, so if all you are doing is cutting polymer decreases, your bits will last for damn near ever. Process. Billet and cast are the two ranges that jump to mind. You can obtain a cast lower, however the frequency at which they appear on the marketplace kinda leaves them as nolo contendere. Billet will leave you with much cleaner lines and a higher general aesthetic, while created will offer you a partially more powerful lower. Likewise bear in mind that a great deal of created reduces are completed on a CNC mill for last information and result in an identical finish as a billet crushed lower. So if you want a particular try to find your build, do not let forged discourage you. Complete. Raw or anodized, really boils down to whether you are going to give your lower an aftermarket surface. If you are planning on having a Cerakote surface applied, I would state, get a raw lower. But if you are just going to leave it as is, an anodized surface is a good idea, especially on a 6061 lower as they are a little more vulnerable to deterioration than their 7075 counterparts. Features. There are a lots of functions and add-ons that exist on lower receivers. From purely aesthetic to strictly functional, some will include considerably to the expense and others are included as requirement. Engraved fire/safe is among the consisted of functions that a lot of makers are including as a standard function. Now while it will not make your weapon shoot any faster, farther, or straighter; it is an indication that makers are paying attention to the information and it contributes to the ended up look of your project. Warranty. Last, however not least, service warranty. If the lower you are looking to buy doesn't included a 100% fulfillment assurance, then don't buy it. Never gamble on an item that isn't really backed by a guarantee.