Start by dropping in the mag catch on the left side of the receiver. Then drop the spring and the magazine release button on top of it in the right side of the AR15 80 lower receiver.
Screw the button on by just a few turns to the right for now. Now, take a punch and depress the spring behind the mag release button all the way down. To gauge how much you want the mag release button to protrude from the receiver, release the pressure you apply from the punch.
If you want the button to stick out more, depress it again, and loosen the mag catch by turning to the left and re-check the distance. Repeat the steps until you are comfortable with how it looks and feels.
Start by inserting your safety selector into the lower receiver. The reason why we do this within the first couple of steps of the AR15 LPK install process is so that it makes gripping onto the lower receiver easier for the rest of the parts installation. Mil-spec triggers are not contained by a housing in the same way that drop-in triggers are which make it more difficult and seemingly daunting to install. Start with the bottom half of the trigger group which has the actual trigger and a spring pointing upwards.
Align that with the hole in the trigger bar while depressing the springs so you can gently hammer a pin through it. Once you have the bottom half of the trigger installed, we move on to the top half which is the hammer and its respective spring. Once you have a pin installed part of the way you can slowly remove the punch and gently hammer the pin all the way through. Just make sure you install your AR15 drop in trigger before you put in the safety selector. I personally use them on all of my builds and they are well worth it for that peace of mind and having to worry about one less thing.
Depending on your lower receiver, this can be kind of tricky. Then, carefully hammer the roll pin partially into the hole on the side without going all the way through to leave room for the bolt catch lever. Hammer the roll pin all the way through the bolt catch until it is being held in place and the pin is flush with the edge of the hole in the receiver. We recommend hammering the roll pin in by using the back of a brass punch to evenly distribute force into the hole. If you use the thinner end of a punch you run the risk of accidentally opening the roll pin which would ruin it and render it unusable.
If you have any issues with having the bolt lock back, sometimes using a Magpul BAD lever can help. As a reminder, an AR15 LPK only includes the buffer retainer kit which is a spring and a plunger which has a small nub that catches onto the buffer weight sold separately keeping it within the buffer tube.
More on this in a bit. Start by sliding the rear takedown through its holes and make sure it's seated all the way. This is where using a thin flat head screwdriver will come in handy to make it easier to seat the end plate properly without damaging the spring or bending it in the wrong way. To make this go smoother, put both the end plate and castle nut partially onto the buffer tube first and partially thread the buffer tube until it is properly aligned.
Align the catch with its channel and release the button. The catch should rest inside its cut-out cannel on the left right of the receiver. The button should be just resting under the surface of the receiver on the right side. Perform a function check of the magazine catch and release button by inserting and removing an empty magazine. Tape the receiver to prevent scratching it in this next step. Insert the bolt catch spring and plunger into the hole just above the magazine catch.
Using a punch and hammer, partially tape the bolt catch roll pin into the first hole on the bolt catch housing. Press the bolt catch into the housing and maintain pressure to align the holes for the pin. Continue tapping the roll pin through the bolt catch housing until it is flush on both sides. Insert the front pivot pin's detent spring into the small hole on the right side of the receiver, immediately next to the pivot pin hole.
Press the pivot pin detent over top the detent spring. You will need to keep the detent compressed with a small blade or knife while you insert the pivot pin. While keeping the detent compressed, slide the pivot pin into its housing. A channel cut into the pin will capture the detent once the pin is fully seated. It is a tight fit. Lubricant helps. With the safety lever fully inserted, flip the receiver upside down.
Drop the safety lever detent into its hole next to the pistol grip mount. Insert the safety lever detent spring into the small hole cut into the top of the pistol grip. Insert the pistol grip onto the pistol mount. Ensure the safety lever detent spring aligns with the detent to capture it. The pistol grip should align with the threaded hole on the mount.
Install and tighten the pistol grip bolt and washer. Hand-tighten the bolt. The washer will ensure the pistol grip bolt does not loosen when the AR is fired. Over-tightening the bolt could crack the receiver's aluminum.
Insert the rear takedown pin detent into the small hole at the rear of the receiver, underneath the buffer tube housing. Insert the rear takedown detent spring in the same hole. Collect the buffer tube, castle nut, and latch plate and thread the castle nut onto the buffer tube. Slide the latch plate over the tube's threads so it rests against the castle nut. Partially thread the buffer tube into the buffer tube housing.
Insert the buffer tube retainer spring into the hole drilled into the buffer tube housing's threads. Insert the buffer retainer over top the retainer spring.
A large punch helps to press the retainer down. With the retainer compressed, hand-tighten the buffer tube until it meets the retainer, capturing it inside the hole. While hand-tightening the buffer tube, ensure the latch plate compresses the rear takedown detent spring into its hole. Keep the latch plate pressed down and tighten the castle nut until the nut secures the latch plate against the rear of the receiver.
The buffer tube needs to be torqued so it doesn't loosen when the AR is fired. Use an Armorer's Wrench to tighten the castle nut. You may need to remove the buttstock or pistol brace from the buffer tube to slide the wrench over the castle nut. Using Loctite or staking the castle nut will help to prevent the nut from loosening. You LPK installation is complete. Depending on the lower parts kit you purchased for your assembly, certain components may need to "break in".
During the break-in period, your trigger may feel heavy or gritty, and springs will feel snappy until they're conditioned.
If you notice any of the issues below, try the troubleshooting steps below. If the trigger fails to reset after firing a round, the hammer may be failing to release from the disconnector. This is a very common occurrence, especially with newly installed LPKs.
Open the receiver and visually inspect the backside of the hammer, and the top of the disconnector. The two surfaces circled in red may need light polishing. If the hammer or hook on the disconnector suffer from small machining marks or metal burs, the hammer may get stuck when it should normally release. When polishing the hammer and disconnector, take very small steps. Removing too much material could cause the disconnector and hammer to fail entirely.
If the problem still isn't remedied with light polishing here, check the orientation of the disconnector spring next. Ensure the skinny end of the spring is facing the disconnector notch.
If the spring is oriented correctly, move onto the next possible issue:. The hammer spring may not be oriented correctly. If it was installed upside down, it will fail to provide the correct force required for the hammer to strike and reset appropriately. The hammer and trigger pins could have small burs or imperfections that would cause the trigger or hammer or both to bind or operate poorly.
This can throw off the timing of the receiver when the AR functions, resulting in the hammer and trigger failing to reset. Best Sellers. There's also an important set of tools that are required or recommended: Parts Required Lower Parts Kit Lower Receiver Castle Nut Latch Plate Buffer Tube Some parts kits do not come with a castle nut or latch plate, and most do not come with a buffer.
Step 1: Trigger Spring Install Install the trigger spring onto the trigger. Step 2: Disconnector Spring Install Install the disconnector spring onto the trigger. Step 3: Hammer Spring Install Install the hammer spring onto the hammer. Step 4: Install Trigger and Disconnector Insert the disconnector onto the trigger.
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