Quarterbore's Forums - How to convert a POST-BAN CAR stock to a real one!

Originally Posted By brushdog of ARFCOM Forums:
Reposted and images uploaded with permission from brushdog...
See: http://ar15.com/forums/topic.html?b=3&f=4&t=201046

First, it's easier to just buy a new stock, but if you must, here is one answer. Depending on how much you could find the parts, or if you already have some of them, you might only save about $20.

I got a fixed stock included in a trade and wanted to play with it. It's a Bushmaster stock with the full length tube and buffer, with the M4 stock pinned into place. I had another RRA M4 stock that is collapsible, so I could compare and use as a correct model.

Here is a list of the stuff you will need.
6 position tube-I believe CMMG has them for $20.
Carbine buffer and spring- I already had a spare set.
You will also need # 3,4,5,6 from the following schematic-

http://www.quarterbore.com/images/ca...gbuttstock.gif

The first step is to remove the stock assembly from the rifle. Take the large allen screw off the stock.

Drill or dremel down the pins. They only have to be ground down enough to let the stock slide off.

Quote:

Originally Posted By bigbore:
instead of drilling out the set pins in the extension, I take punch and pound them the rest of the way into the extensin. The stock slips right off........

http://www.quarterbore.com/images/car-fixed1.jpg

Next, I found a drill bit that is the same diameter as my RRA collapsible stock (5/16"). I dropped the drill bit down into the RRA stock and marked the bit so I wouldn't go to far. Then I set up the Bushmaster stock on the drill press-DON'T drill all they way through the stock, or the pin holding the spring and nut will slip down through the bottom of the stock.

http://www.quarterbore.com/images/car-fixed5.jpg

http://www.quarterbore.com/images/car-Fixed.jpg

http://www.quarterbore.com/images/car-fixed6.jpg

Then start assembling the buttstock, drop the spring and bolt into the stock from the top, and then the other parts from the bottom. I found it easiest to install the nut and lock pin by sliding in the old full length tube in the stock so it compresses the spring so I could install the lock pin effortlessly.

http://www.quarterbore.com/images/car-FIXED3.jpg

Stock on my M4 clone
http://www.quarterbore.com/images/car-Fixed4.jpg