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Old 08-20-2013, 01:54 AM   #1
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Default Basic questions from a noob

So I'm wanting to build/buy my first AR. I thought I knew what I needed to know but apparently I don't. My end goal would be to get a 50 beowulf upper. According to Alexander Arms their 50 beowulf uppers work on a 223 lower. However as I've done more research several sources say a 308 upper won't work on a 223 lower. So can somebody explain the compatibility?

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Old 08-20-2013, 02:01 AM   #2
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Dude you have got to get your handle changed.

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Old 08-20-2013, 02:18 AM   #3
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Google says it will work.

Quote:
Q1. Will your upper receivers fit on my AR-15 lower receiver?

All of our upper receiver assemblies will fit on any mil-spec AR-15 lower receiver. No fitting or modifications are needed. If your lower receiver is made to standard AR-15 specifications, our upper receivers will drop right on.
Q2. Will my mil-spec AR-15 upper receiver assembly work on your .50 Beowulf or 6.5 Grendel lower receiver?

Yes, it will work. Each and every upper and lower receiver that we produce is designed around standard AR-15 specifications and can be used interchangeably with other mil-spec uppers and lowers as long as those products also require standard AR-15 specifications.

http://www.alexanderarms.com/index.php/products/product-faqs.html
I am guessing a phone call or email before you purchase would be in order, if you have doubts.

Cause you can find anything on the interwebs.

But they are saying their uppers work on a standard AR-15. You should be good to go if a mil-spec lower is what you have.
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Old 08-20-2013, 02:24 AM   #4
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Quote:
Originally Posted by Gunsmith91
I'm looking at 50 beowulf not 50 bmg. Beowulf has semi auto uppers
The Beowulf will work on an AR15 lower.

These calibers will work on AR15 lower.

On 223 case, standard mags
17 Fireball
17 Remington
19 Calhoun
204 Ruger
25-223
6 x 45
the TCUs
6.5 MPC
300 Blackout/Whisper
7mm Whisper
7.62x40

Non-223 case, standard mags
450 Bushmaster
458 SOCOM
458 RMW ("SOCOM lite")
44 AMP (RMW) - need spacer in mag
45 Win Mag (RMW) - need spacer in mag
50 AE - need spacer in mag
440 CorBon - need spacer in mag
50 GI - need spacer in mag
50 Beowulf
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Old 08-20-2013, 02:26 AM   #5
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Let not forget the magazine well! .308 is just too long to squeeze into a AR15 magazine/well.

This would not preclude a single shot (bolt action or the much lauded SLoBBER action).

.50 Beo is sized right with the AR15 mag in mind.

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Old 08-20-2013, 02:28 AM   #6
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These calibers work on AR 10 lowers.

•.243 Winchester
•.22-250
•.257 Roberts
•.260 Remington
•6.5 Creedmore
•6.5 WSM
•.270 WSM
•7mm WSM
•7-08 Remington
•284 Winchester
•.300 WSM
•.300 RSAUM
•.300 Savage
•.338-7mm Benchrest
•.338 Whisper
•.338 Federal
•.338 RCM
•.35 Remington
•.358 Winchester
•.358 HDH (WSSM)
•.450 Marlin

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Old 08-20-2013, 02:31 AM   #7
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Thank you all very much. That's what I was looking for that I couldn't find

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Old 08-20-2013, 02:32 AM   #8
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Like texas said the beowulf will work just fine on any standard AR lower.

Here are some pics of my Alexander Arms standard 50 Beowulf Upper on a standard AR lower, shoots great.

100_0491.jpg   100_0492.jpg   100_0495.jpg  
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Old 08-20-2013, 02:35 AM   #9
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I bet that sucker is fun to shoot. Makes the 5.56 look like a .22. Wait a second...

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Old 08-20-2013, 02:39 AM   #10
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It is fun but somehow I never shoot more than 20rds per range outing...

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