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Old 06-13-2018, 02:23 PM
Herman48 Herman48 is offline
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Default .50 Beowulf complete upper

I am thinking about purchasing a complete .50 Beowulf upper
for my recently purchased M&P 15 .223. Those uppers only fit mil-spec lowers. Is the M&P 15's lower mil-spec?
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Old 06-13-2018, 10:55 PM
cyphertext cyphertext is online now
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Is the M&P 15's lower mil-spec?
Mil-spec dimensions?... yes. Truly mil-spec?... No, as there is no such thing as a mil-spec AR made for the civilian market.
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Old 06-14-2018, 12:07 PM
locolobo56 locolobo56 is offline
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There are military specs for the ar-15. Most aftermarket parts are made to military specs due to the wide market for them and should fit ARs from most manufacturers. For example: there are only a few receiver manufacturers who stamp them with logos and features for the different AR companies. If the manufacturing process was not held to some sort of standard, their products would be in limited demand. The standard is military specifications. With that said, I have seen some products that needed a little "adjustment" to fit properly.
AR-10 products are another matter. There is no Mil-spec standards for this adaptation of the AR-15 platform so manufacturers have no exact standards to strive for. Therefore it is best to purchase the major components from the same manufacturer.
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Old 06-14-2018, 12:15 PM
moralem moralem is offline
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Default .50 Beowulf complete upper

Alexander Arms beowulf.50 fits fine on my colt m4 lower. The upper pictures show it without the muzzle brake and the lower features it with a Witte machine tactical brake.

Last edited by moralem; 06-14-2018 at 12:19 PM.
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Old 06-14-2018, 03:41 PM
cyphertext cyphertext is online now
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Originally Posted by locolobo56 View Post
There are military specs for the ar-15. Most aftermarket parts are made to military specs due to the wide market for them and should fit ARs from most manufacturers. For example: there are only a few receiver manufacturers who stamp them with logos and features for the different AR companies. If the manufacturing process was not held to some sort of standard, their products would be in limited demand. The standard is military specifications. With that said, I have seen some products that needed a little "adjustment" to fit properly.
AR-10 products are another matter. There is no Mil-spec standards for this adaptation of the AR-15 platform so manufacturers have no exact standards to strive for. Therefore it is best to purchase the major components from the same manufacturer.
Colt would disagree with you. You can not be "Milspec" without being inspected and accepted by government inspectors.

American Rifleman | The MilSpec Definition

Also, while it is true that there are few forges that produce the upper and lower receiver blanks, each individual manufacturer is responsible for the final machining and engraving... Two manufactures can receive the same forged blanks from the same forge, like Cerro Forge, but can provide different levels of finished quality due to their own machining and QC standards.
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Old 06-14-2018, 08:09 PM
Herman48 Herman48 is offline
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I guess I should have said "standard" instead of "mil-spec." Anyhow, I got an email from Ruger in which was said that Ruger lowers are standard. On the other hand, Ruger uppers and bolt assemblies are not, I believe. The Ruger firing pin is not interchangeable with other brands' and I read somewhere (but I may be mistaken) that the carrier is non-standard, either. Maybe Ruger wanted to prevent basement tinkerers from trying to make the AR 556 into a full-auto gun. Maybe. I don't know enough about AR 15's even though I have three of them: a Colt Sporter post-ban, dehorned, the Ruger, and a S&W M&P 15. When I bought a Bushmaster upper with a 24" fluted barrel for my Colt, I had to buy an offset hinge pin because the Sporter's pin did not align with the new upper. I wish those who make AR 15's all remained within the same specs as everybody else's.
Thanks for the answers. I am waiting for a new credit card that will give me $250 if I charge on it $1000 the first month, and as soon as I get the card I'll order the .50 Beowulf with the fixed muzzle brake, a 10-round magazine, and a few boxes of ammo with the Hornady XTP bullets. I want to use this caliber on hogs and deer. I have been using a Ruger M77 in .338 WM but it's too long and cumbersome in a blind and all my shots at the deer I've harvested these past five years (9 whitetails) have been between 10 and 90 yards.
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Old 06-15-2018, 12:28 PM
cyphertext cyphertext is online now
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Most uppers and lowers made today are going to be made to the same dimensions. The days of Colt using different sized pins for their commercial rifles are behind us. You can take the BCG from your Ruger AR-556 and run it in your other AR-15s... As a unit, it will work. What you can't do is run the M16 firing pin in your Ruger, as the larger flange will get hung up in the notched hammer. Why Ruger used this setup when every other manufacturer including Colt who developed it for political reasons, has moved away from it is anyone's guess.

As far as the Ruger upper, it will connect to other lowers... The part that is "non-standard" is the gas block/front sight assembly and the Delta ring assembly. This has caused Ruger owners some headache with certain after market handguard and rail setups. Ruger tried to reinvent the wheel for market differentiation.
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