Can i put a collapsible stock on a 20" AR15?

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Providing you get a collapsible stock that comes with its own buffer tube, and carbine length buffer and spring, yes. (Careful when removing the buttstock - there's a captive spring and detent under there for the rear take down pin. You can launch it if you aren't careful)

With a heavy barrel, it will feel pretty nose-heavy... I think it's kind of awkward, but if the option is not being able to use it at all, well.. go ahead. With an A1 weight barrel, it's still a little nose-heavy, but not bad at all.

A heavier collapsible will balance better, of course. The big chunky MagPul one would prolly work quite well.

Another option is a shorter-length fixed stock - the A1s are considerably shorter, and are fairly cheap on the surplus market.
 
"Looking funny" is in the eye of the beholder. IMHO, a 20" AR-15 with a telestock looks cool.

A 20" barrel with a telestock makes a lot of sense, IMHO. You get better ballistics, along with the adjustable LOP of the collapsing stock. AAMOF, The Canadian army is using 20" rifles with telestocks.

There is some scuttlebutt that the USMC is looking at making an M-16A5, which would be an M-16A4 but with a telestock. One problem Marines are encountering in the current war is that while wearing body armor, the A2-length stock on the A4s is too long. A telestock would fix this, so I hope this rumor is true.

Telestocks need a carbine buffer tube and matching buffer.

HERE is a picture thread over on Arfcom dedicated to this kind of setup.
 
Yes, you can. No issues whatsoever.

As to problems/advantages/disadvantages...

1. Complexity. It is one more thing to go wrong. No, I don't view this as a huge negative. My "serious" AR has a Vltor adjustable stock.

2. Aesthetics. There is no right or wrong, since we're not talking about Glocks ( :neener: ).

3. Adjustable LOP. Huge advantage to the collapsible stock, unless you happen to fit the A1 or A2 perfectly, never loan your rifle to anyone, and always wear the same clothes to shoot.

4. Cheek weld. On most collapsible stocks, the cheek weld differs depending on how far in the stock is set. Minor drawback.

5. Balance. Entirely subjective, but the collapsible will balance differently. How differently depends upon which stocks are being compared.

6. Firmness/feel. Some people hate the wiggly feeling that most collapsible stocks give. Some don't mind it. Some stocks lock up rock solid.

Mike
 
Just a quick revival to answer this question: which commercially available collapsing stocks seem to balance out this configuration? I hear the SOPMOD stock is good, but what else?
 
I've got a telescoping stock on my 20" HBAR. I can't use the standard stock when I'm wearing a vest on duty. I don't care whether it looks cool or not, as long as it fits. It is a little nose heavy, but that just helps make it more controllable in rapid fire.
 
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Better to get forgiveness than permission. ;)
 
To answer the combat question, Canadian Military standardized the C7A2 which features a flat top upper and a telescoping buttstock in 2005.
They are in service in Afghanistan.
 
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