Still, on construction, these drill bits are crafted from superior Ultra-fine tungsten steel bar which is highly flexible. At the same time, this enhances their production efficiency, while reducing the changing times. On top of that, these drill bits are hard and include a TIAIN coating.įor this reason, they’re suitable for processing heat-treated materials under 32 degrees with high speed. Instead, this AR drill bit set has many stand-out features including a durable HSS construction. Surprisingly, those are not the only features that make this set the best drill bits for 80% lower! More notably, they’re durable and sharp to enhance their machining efficiency and ensure convenient chip removal. The bits have a U-shaped groove design and a large front angle to reduce cutting resistance. AUTOTOOLHOME HSS Drill Bit Setįirst on the list is this set of 4 flute end mills from AUTOTOOLHOME. Now, let’s move on to the best drill bit sets for 80% lower reviews! 3 Best Drill Bits for 80 Lower 1. Moreover, the 3/8” end mill works well with drill presses and delivers a clean cut. Note, you can use any diameter end mill to mill the main cavity. Used to mill the receiver’s rear shelf portion. Used to mill the main cavity for installing the parts kit. Used to cut the trigger slot in the receiver’s floor. Used to drill the pin holes for the disconnector/ trigger and hammer. Used to drill the safety selector lever pinhole and mill the pilot hole. With that in mind, you’ll need the following drill bit sizes when working on 80% lower
More importantly, you may want more than one drill bit size, especially if you’re planning to drill holes of various diameters. On the bright side, all AR’s calibers utilize the same pinhole diameters and part kits.įor that reason, the bits needed for chewing through AR lowers are universal. The same case applies to the best drill bits for AR lower. First, let’s check out the ideal drill bit sizes for this project! What’s the best drill bit size for drilling 80% lower?Īs said earlier, drill bits are available in many sizes to create various types of in different materials. Thanks to our comprehensive review of the best drill bit set worth buying for drilling holes into your AR lower.
Therefore, it is easy to end up with the wrong drill bit set for machining your 80% lower.įortunately, this article will help you avoid that. On the same note, these tools are designed to perform different tasks. For that, not every drill bit set out there will machine your 80% lowers with efficiency.īesides, drill bits are made up of different materials and come in various sizes. One thing you need to remember though is that drilling on AR lower is quite different from working with other materials. However, you’ll need other tools as well including the best drill bits for 80% lower. A drill press is one of the most important tools for finishing 80% lower.
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