Take special care to make sure pin in in place before driving it, and ensure that it is held securely in place when striking the punch. Fiberglass packing tape - 2 layers thick - taped over the receiver just between the receiver and the punch can help avoid scratching. When installing the bolt catch, first drive the roll pin about halfway into the rear hump from the rear of the receiver using roll pin holder.
It can be very difficult to get this pin started; you might want to try squeezing the roll pin on one end with pliers or the vise before starting. Install spring in hole on left side of receiver. Install bolt catch plunger on top of spring with round portion on top and small end into receiver. Make sure it moves freely in its hole.
Install bolt catch in receiver; it only fits on one way. The pin can be driven the rest of the way from the rear as the punch will be pushed out and while holding the bolt catch in correct alignment. Insert spring and detent into receiver.
Push out tool with pivot pin and rotate until detent is in groove of pivot pin. The idea is to insert the spring and detent, and then compress them as you insert the pivot pin. A pair of needle-nose pliers can be helpful. Install disconnector spring with the wider portion of spring down towards trigger and push until it locks in there.
Position disconnector on top of trigger, where trigger pin will hold both in place. Insert trigger assembly into receiver. Insert trigger retaining pin through receiver, trigger, and disconnector. The trigger pin has 2 grooves in it; one in the middle of the pin and one off to one side. It does not matter which way it is inserted, though common practice is to insert from left to right, with the groove to the left.
Insert hammer pin from opposite side to help align things as you push the trigger pin in and the hammer pin out. You will have to push down on trigger assembly to align the holes and get the pin in all the way.
Verify that the disconnector pivots when pushed. Like the trigger pin, you may have to push down and align the holes perfectly in order to push the pin in all the way.
Ends of the hammer spring will rest on top of the trigger pin, with one end in the groove on the trigger pin. Inserting the hammer pin may require some effort, as the J-pin in the hammer will catch the grooves in the pin. Verify that hammer pivots forward when trigger is pressed. Without releasing the trigger, push the hammer back again and verify that it locks caught by disconnector. Releasing the trigger should not cause the hammer to pivot fully forward caught by trigger.
Hammer will fall when trigger is pressed. Carefully compress the spring with the grip and make sure spring fits into hole in grip. Check the function of the selector with the grip held in place; if too tight unable to rotate you may need to either cut the spring, or clean out the hole in the grip. Once feel is acceptable, secure the grip in place with the screw and lock washer. It should not move past the 'safe' or 'fire' positions.
With selector on 'safe', verify cocked hammer is not released when trigger is pressed. With selector on 'semi', verify hammer is released when trigger is pressed. NOTE: Selector cannot be rotated to 'safe' unless hammer is cocked. Install buffer extension, buffer tube ; press detent when necessary; torque to ft-lbs add spacer onto stock tube, and insert stock. B Next you will want to install the roll pin on the other side through the trigger guard.
This can be done a few ways, my preferred approach is to use a vice to squeeze the pins through. Using masking tape on the opposite side of the receiver to protect it from scratching, tighten the vice to push the poll pin in place. Alternatively, you can use a soft face hammer while supporting the underside of the receiver with a wood block. A The first step for trigger assembly is to properly install the trigger spring on to the trigger as shown below.
The trigger and hammer spring look similar however the hammer spring is a bit thicker and stronger. B Next you will insert the disconnector spring into the trigger. Note that the spring is flared or tapered, one end is larger than the other side. The larger end is pressed into the trigger as shown below, once installed it should stay firmly in place. C Insert the disconnector on top of the trigger like shown below, then drop the trigger assembly into your lower and start the installation of the pin on either side of your receiver.
The ends of the trigger spring should be facing toward the magazine well on the bottom of the trigger pocket. D Align the holes of the trigger and disconnector through your receiver so that you can push the trigger pin through.
This can be a tricky step since the spring is applying tension to the trigger making if difficult to align with the disconnector and receiver. You will have to wiggle the trigger and disconnector to have the holes line up so that the pin can go all the way through.
A Insert the safety selector into your receiver, for now this is all you need to do with it but it must be installed at this point. The detent for the safety will be installed on step 7. C This is another tricky step.
Lower the hammer into your receiver with the two ends of the hammer spring resting behind the trigger pin. Then push the hammer further down until the holes of the hammer and lower receiver line up.
Finish the hammer install by inserting your hammer pin. You made need to wiggle things around again and use a soft faced hammer to punch it in. You will be building them yourself!
In this tutorial, I use simple methods to build a fully functional AR15 lower receiver. You probably have all the tools you need in the garage. New Rifleman L. This guide is for visual reference only. If you lack the proper tools and experience, please have your rifle assembled by a professional armorer. Next is the dreaded trigger guard. Just install the trigger guard when you feel up to the task. Just support both ends and line up the trigger guard hole and you will be fine no matter what your method.
Bolt catch: another simple assembly. Here you need a special punch to keep from scratching your lower receiver. I have used this method on four lower receivers to date.
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