We are going to be building a NY AWB compliant AR15 rifle during this tutorial. An Essential Arms lower receiver will be the base of this rifle. To begin we will start with the Essential Arms lower receiver and a DPMS lower parts kit.
First open your lower parts kit package and be sure that that all of the parts are there, next locate the magazine catch, magazine release, and magazine catch spring.
Insert the magazine catch into the left side of the receiver and then lay the receiver on its left side. Now insert the magazine catch spring into the receiver and then depress the spring with the magazine release button.
I like to use a wood dowel to depress the magazine release button while I spin the magazine catch to screw in the magazine release button.
Once the magazine release assembly has been installed use a magazine to ensure that it functions properly.
Now locate the trigger guard and roll pin.
Insert the front part of the magazine guard into the hole at the front of the trigger guard.
Now, line up the rear part of the trigger guard with the holes in the receiver and gently tap the roll pin into place. MAKE SURE YOU SUPPORT THE EARS OF THE RECEIVER WHEN INSTALLING THIS PART, FAILURE TO DO SO COULD RESULT IN YOU BREAKING AN EAR OFF OF YOUR RECEIVER. You can also you vice grips to squeeze this pin in.
Next, locate the bolt catch assembly. This consists of the bolt catch, a roll pin, a spring, and a detent.
Insert the spring and detent into the receiver and tape off part of the receiver to prevent dings and scratches when tapping the roll pin into place.
Now align the bolt catch with the roll pin and gently tap it into place.
Next we will be installing the front pivot pin into the AR15 receiver. This is probably the most difficult part of the build. Locate the pivot pin, spring, and detent.
Insert the spring and detent and then use something thin, something like a credit card, to hold the spring and detent in place while you slide in the pivot pin. Be on the lookout for the spring and detent to go flying across the room, some people put the receiver into a plastic bag while they install this part.
Locate the trigger and trigger spring for the next step.
Install as seen below.
Insert the disconnector onto the top of the trigger mechanism and insert the roll pin into the receiver while aligning all of the parts.
Now assemble the hammer and hammer spring into the lower receiver.
I like to use a punch to align the hammer and hammer spring while I slide the pin into the receiver.
Now we are going to install the safety so we need to locate the safety, pistol grip, spring, and detent.
Insert the safety into the receiver from the left side. Now insert the detent and spring into the bottom of the receiver. The hole for these parts will be where the pistol grip slides onto the receiver. Align the spring into the hole in your pistol grip and screw the pistol grip into your receiver.
Next we will install the buffer tube on the receiver. Locate and install the detent and spring that goes into the back of your AR15 receiver. You will have to install the rear takedown pin into your receiver before doing so.
Once those parts are installed begin to screw in your buffer tube while making sure that the spring in the rear of the receiver does not twist or pop out.
Before you give the buffer tube its last turn or two install the buffer detent and spring.
The buffer tube should hold down the buffer detent.
At this point your entire lower receiver should be completely assembled and look something like this.