![]() In the same fashion as the trigger, install the hammer spring onto the hammer. You can use the 3/32" punch to gently push the spring down until it is fully seated. Ensure the bottom of the spring is fully seated. It's a tight fit, so applying some lubricant is helpful. Insert the fat end of the spring into the recessed hole atop the trigger as shown. ![]() The spring is easily identified because it's the only spring that is fatter on one end. ![]() Orient the trigger vertically, and collect the disconnector spring from the kit. Ensure the metal wire connecting both loops rests underneath the sear (the front, flat part of the trigger) as shown. Slide one loop of the spring over the trigger pin hole housing, then repeat on the opposite side. Mechanically, this is no different than any other mil-spec kit install for an AR pistol or rifle chambered in 5.56/.223 (or 300 Blackout).ġ. We're installing a pistol brace instead of a buttstock, but we're still using a standard carbine buffer tube and castle nut. A mil-spec LPK includes a single-stage trigger and factory springs, pins, detents, and parts. This is considered a "mil-spec" parts kit, it runs very smoothly, and it's affordable. Required to install the pistol grip's screw and washer.īefore starting the assembly, verify you have all the required parts.įor our install, we're using the Anderson Stainless AR-15 LPK. Essential for making pins slide in easily, lubricant will also help protect your anodized finish. Useful for keeping the spring-loaded detent compressed when installing the front takedown pin. This is of particular concern when installing the bolt catch roll pin. Useful for covering up your receiver's finish to prevent damage while hammering and using the punches. Useful for handling the tiny detents and springs that retain the takedown and pivot pins. To be used with your punches, the hammer will also help with installing the pins for the hammer and trigger, which make for a tight fit. The last two are optional but helpful, while the first is essential: You'll need the 3/32" punch to install the roll pins for the bolt catch and trigger guard. 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 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. The Aero Precision M4E1 lower receiver is a great product with a number of features that make it better than a basic lower receiver.
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