AR-15 barrel pinning

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No.

I can't imagine how you could do that either.

The front take-down pin is almost 1/2" away from the bottom of the barrel extension & barrel nut threads in the upper.

rc
 
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It seems, to me at least, that an ar15 can be made plenty accurate without needing to resort to that.
 
+1

Unlike a bolt-action rifle for instance?

On the AR-15 design, the barrel, bolt, and sights are all firmly attached to the upper receiver.

The fire control parts are contained in the lower receiver.

It doesn't really matter much what the lower receiver does.
Because it has very little if any influence what the upper receiver, barrel, bolt, and sights are going to do.

Lots of shooters like tight upper/lower fit, but it's more a matter of things rattling around then any increase in accuracy. That can be fixed with a $1.99 plastic accu-wedge.

The other thing is, If you somehow pinned the barrel to the lower receiver, there would be no way to open the gun up for cleaning & maintenance easily in 5 seconds.

rc
 
I've seen the upper and lowers "pinned" through the rear takedown pin with a screw. It's an approved mod by the CMP for their matches.
 
With the barrel pinned to the front the gun opens as normal. This rifle exists and has interchangeable barrels to 300 blackout. This along with several other custom designs are incorporated. When I get mine in a couple weeks ill post pics.
 
With the barrel pinned to the front the gun opens as normal.
Click to expand...

It can't be "pinned" to the lower receiver and still allow the gun to open as normal. What you may be thinking about is a barrel attachment method similar to that of the Korean Daewoo, in which the barrel extension is pressed into the upper receiver and then fastened with a pin (a barrel nut is not used with this system). This pin (on the Daewoo) is tubular and is threaded on the inside, so that a set screw (or special tool) can be inserted and tightened, forcing the locking pin to back out. Then the barrel can be replaced and the locking pin driven back in. If you want to have easily-replacable barrels, this system is better than having to torque a barrel nut every time.
 
Maybe he means an AR with a quick change barrel.

Those usually have a clamping bolt near the front takedown pin.

Proline, if you are taking possession of such a thing shortly, what brand and model is it? That should settle any confusion.
 
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