Quck AR Upper Question...


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peck1234
October 20, 2008, 11:00 PM
I currently have a 5.56mm upper for my AR.

If I bought a 7.62/39 upper would I have to change bolt assembly?

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ugaarguy
October 20, 2008, 11:03 PM
Yes, 5.56 and 7.62x39 use different bolts.

Glock Holiday
October 21, 2008, 12:38 AM
You'll need a different lower also.No way AK mags will fit in a standard AR lower mag well.

yenchisks
October 21, 2008, 12:40 AM
what about 5.45x39:?

ugaarguy
October 21, 2008, 01:16 AM
You'll need a different lower also.No way AK mags will fit in a standard AR lower mag well.
Who said you have to use AK mags? http://www.cproductsllc.com/shop/product_info.php?cPath=22_36&products_id=59
what about 5.45x39:?
Uses its own bolt too, but ammo should feed fine from 5.56 magazines.

drgrenthum
October 21, 2008, 04:02 PM
get a complete upper from del-ton or other so you wont have to worry about getting parts that fit in an upper for 7.62.

+1 on what ugaargu said. No need for a new lower but you still need different mags which are a little bit more expensive then your standard AR mags

Nhsport
October 21, 2008, 08:30 PM
The front of the bolt is the part with the extractor that fits onto the rear of the cartridge. Therefore unless the cartridge that you wish to change to happens to be the same size you will need a new bolt.

Many folks believe that the bolt on an ar should be kept with one barrel and that swapping a bolt from barrel to barrel will wear the bolt lugs faster . This has been the way I run my ARs . I have a bolt for each rifle (even though most are 5.56)

AR-15 Rep
October 21, 2008, 09:54 PM
A 7.62 X 39 Upper will fit on a AR Lower. You can use a straight 20rnd Mag and it will fit and feed just fine. The bolt is different but that can come with the upper.

A square 10
October 21, 2008, 11:47 PM
AR-15 REP has it right - the lower will function as will the mag for both 556x45 and 762x39 , your upper will be diferent [thats so obvious] but i said it anyway , the diferance between a 22cal and 30cal bbl is just so easy , as is the bolt head and extractor ,

the length of the cartrige makes a bigger diferance [762x51 will be a diferent lower & upper], and no you wont use an AK magazine in an AR

peck1234
October 22, 2008, 10:37 PM
thanks all! : ) So the bolt assembly uses the same bolt carrier tho....

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