If you have an Aero Precision M4E1 lower and need the set screw, we are happy to toss one in on any SpiceTac order for you. (Most Aero LPKs do include the set screw though, so check there first) The Aero Precision M4E1 stripped lower receiver does not come with the set screw or the wrench for it. If you choose not to go the set screw route, the detent spring can be installed just like you would on a normal lower. No locktite is needed since the screw can't move forward against the spring or backward against the end plate. I used a stainless steel set screw that was 1/8" long and it worked well.Ībove: The 4-40 Set Screw Will Need a 0.050" Allen Wrench This will maintain the same amount of spring pressure on the detent.Ībove: Shorten The Spring By The Length Of The Set Screwįor this project you will need a 4-40 set screw and a 0.050" Allen wrench for it. It's best to shorten the spring by about the same length as the set screw. Since the set screw will take up some of the space the spring normally would have, you will have to shorten the spring. It also makes it super easy to swap stocks since that spring will never have to be dealt with again. It makes it easier to assemble everything with less chance of mangling the spring. Typically, this spring is pushed in during the receiver extension assembly and held in place by the end plate.Ībove: The Takedown Spring Protrudes And Can Be Mangled During Installationĭue to the Aero Precision design, a 4-40 set screw can be used to hold the spring in instead.Ībove: The Installed Takedown Spring and Set Screw The rear corners of the upper, the part where the lower pins mate, might be rubbing up against the back inner corners of your lower. It's this last one, that super handy TTPDR, that we're talking about today.Īero Precision has threaded the channel where the rear takedown spring resides.Ībove: The Aero Precision Takedown Pin Detent Channel Is Threaded For A 4-40 Set Screw The Aero improvements include an Integrated Trigger Guard, Threaded Bolt Catch Roll Pin, Upper Tension Screw, Increased Magwell Flare and Threaded Takedown Pin Detent Recess (TTPDR). The usual lower receiver offers a number of opportunities to mar the finish, snap trigger guard ears off, launch detents into orbit and mangle springs during assembly. You can make all the difference in someone's life.The Aero Precision M4E1 lower receiver is a great product with a number of features that make it better than a basic lower receiver. Suicide Prevention Lifeline Website or call them at 1-80įor international help please visit 's Hotline Finder to get in touch with the assistance available to you in your country. Don't let yourself or another fall to suicide. There are many resources available for veterans and civilians alike. If you or someone you know is considering suicide please help them. Suicide is a serious problem all around the world. Keep weapons out of the reach of children, criminals, and other prohibited persons - it is your responsibility to protect your firearms!.Alcohol, legal and illegal drugs, and firearms are never a good combination.Only use the ammunition type stamped on the barrel or listed in the user manual.Ensure the weapon is safe to fire, a gunsmith is cheaper than a hospital visit.Keep your finger straight and off the trigger until ready to shoot.Never point a firearm at anything you're not willing to destroy.Treat all firearm as if it were loaded.r/Firearms users can't read apparently.Įveryone is a Range Safety Officer, if it seems unsafe call it for a cease fire! If you're a vendor, don't make posts that are glorified ads for a product and ghost. Given recent events, we don't want to run any risks with this community. Please avoid linking to any third-party vendors.To include the solicitation or facilitation of any transaction or gift involving 3D printing files to produce firearms. Politics and News posts require moderator pre-approval and are limited to legislation with direct impact on the AR15 platform.It can rub the back of the upper and cause this problem. Don't just show us your build, tell us about it. Check to see if the buffer tube is installed too far into the back of the receiver. Images, videos, and links require a descriptive comment.All posts and comments are to be civil. Where you can find DIY, FAQ, and more! Subreddit Rules Welcome to /r/AR15! Here for your favorite black gun links, build photos, questions and other tactical or practical info.
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