[ARCHIVED THREAD] - Retarded Question

Posted: 3/4/2012 2:53:18 PM EDT

I currently have a Bushmaster xm-15 A2 cal. 5.56. I was wondering if it is possible to buy a .308 cal. upper assembly and use it on my current bushmaster lower? or are the two not compatible

Posted: 3/4/2012 2:57:06 PM EDT

[#1]

No. The .308s have a longer upper and lower to accomodate the longer .308 cartridge.

Posted: 3/4/2012 3:15:29 PM EDT

[#2]

Most of us have wondered the same thing at one time or another...

You will need a larger lower. I still don't know all the calibers that require the larger lower, but certainly they include everything based on the .308.

Posted: 3/4/2012 3:49:36 PM EDT

[#3]

I had the same question.

Check out this link and go to #15.

Hopefully that helps a little

Paul

Posted: 3/4/2012 6:12:37 PM EDT

[#4]

For a new guy that is an easy question to answer yourself. Pick any .308 magazine fed rifle, say a M-1A or HK/FAL. Look at the magazine. Then compare to an AR-15 magazine. The .308 is longer from primer to bullet. Enough said.

Posted: 3/4/2012 7:47:38 PM EDT

[#5]

Thanks for the help

Posted: 3/4/2012 8:54:38 PM EDT

[#6]

Depends on what .308 you had in mind.

Check out the variant forum

Posted: 3/5/2012 4:16:49 AM EDT

[#7]

There I a single shot .308 upper you can use on your ar15 lower.

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