In B.O. Special, I introduced the newest addition to the gun cabinet and reviewed the rifle kit from Del-ton.
In Part 1, we talked about tools and preparation and installed the magazine catch.
In Part 2. we installed the trigger guard.
In Part 3, we installed the bolt catch.
In Part 4, we installed the pivot pin.
In Part 5, we installed the trigger assembly.
In Part 6, we installed the hammer assembly.
In Part 7, we installed the selector and pistol grip.
This part wasn’t explained well in the arfcom instructions so I had to find another thread on arfcom that covered installing the M4 buttstock. It wasn’t hard, but I wanted to be sure I was putting everything in the right way.
Then the backplate is installed. The backplate has a tab that fits in a groove in the threads of the buttstock tube that ensures it stays aligned. Also, there is a stamped “well” in the bottom part of the backplate. The protruding part of the well should be forward, towards the receiver.
Sorry about the blurry photo. I’ve still got that same crappy camera I’ve been complaining about for years. As long as it works, I can’t justify the expense of buying a new one…the darn thing just won’t break.
I’ve thought I’ve killed it a couple of times, but taking the batteries out and putting them back in (the digital camera version of control-alt-delete?) brought it back to life each time.
It just occurred to me that I’ve reverted to my Navy days and have started occasionally using the terms “aft” and “forward”. Versus going back and trying to find and correct all the times I’ve used those terms: “aft” means the back, the rear, the posterior aspect; forward means the front, the head, the anterior aspect. On a ship, aft is the blunt end and forward is the pointy end.
On a rifle, aft is the end you should be on and forward is the end that should be pointing at your target.
If I start using “port” and “starboard”, you have my permission to whack me in the back of the head.
Then drop the buffer retainer spring into the retainer hole.
You want the buttstock tube to prevent the retainer from coming out of the hole, but not restrict its up and down movement. The pin on the top of the buffer retainer should stick up slightly beyond the inside edge of the buttstock tube.
Next, push the backplate forward on the tube to seat it against the rear of the receiver. This will compress the takedown pin detent spring. As you first start compressing the spring would be a good time to rotate the takedown pin a little and be sure the detent is seated in the groove in the takedown pin body.
The protruding part of the stamped well in the backplate will help insure that the backplate is aligned properly with the reciever. The tab on the backplate, locked into the groove in the buttstock tube threads, ensures that the buttstock is properly aligned to the receiver.
It probably wouldn’t hurt to put some thread locking compound on the threads before tightening to help keep the locking ring from backing out. I didn’t (this time) but if I have trouble with it loosening up, I will.
Next time, we’ll install the assembled upper, take Barack to the range and finish up the series.