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Posted: 11/21/2013 2:13:55 PM EDT
| I am in the midst of building a .223 Ar. After i finish the build, I'm interested in putting together a .308 upper to swap in for SHTF, possibly hog or varmint hunting. using a standard milspec lower receiver, parts kit and buffer will swapping the two be as simple as pulling the take down pins and swapping the upper half? Given that the upper is fully assembled. Also, can you use the same bcg? |
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You're wanting this.
Colt 901 .,...And it's the only way (that I know of) to acquire something like you're talking about on the firearms market. Other than that, you're basically going to have to build two seperate rifles. Are you thinking of a .300 AAC Blackout upper? You can do that...build a .300 AAC upper that will attach to a standard AR15 (223/5/56) lower. |
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Not to sound like an ass. But when you say .308 do you mean .308 winchester or a .308 projectile?
If you want to swap to a .308 Win you'll need a completely different lower, unless you have a Colt LE901. The .308 Win is much longer than a .223 Rem and will not fit in the standard AR15 lower. However, if you want a .308 projectile, you can swap to a .300 AAC Blackout. It uses the same parts as a .223, just a different barrel and ammo of course. |
| I apologize for my misconception, I now realize the reasons it wouldn't work. I do like the idea of having a .300 black to swap in though as I don't feel the .223 rem would be entirely sufficient to defend against a person or take down a fairly large sized game. Obviously tthe .223 is much more logical for plinking/hunting squirrels or foxes as ammo is sufficiently available and cheaper. |
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Quoted:
I apologize for my misconception, I now realize the reasons it wouldn't work. I do like the idea of having a .300 black to swap in though as I don't feel the .223 rem would be entirely sufficient to defend against a person or take down a fairly large sized game. Obviously tthe .223 is much more logical for plinking/hunting squirrels or foxes as ammo is sufficiently available and cheaper. A heavy, open tip match round (like Black Hills 77gr 5.56, aka Mk 262) is going to rip a bad guy apart within the close quarters you would likely be defending yourself in. |
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Hey if you want a good round that uses the same bolt group and is 308 .
Take a look at the 762x40 Wilson tactical .. Beats the 300 Black out and the 6.8 easy swap too.. even use the 223case.. $250.00 for the barrel. Good for Der and Elk here in Colorado. locodriver 
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Quoted:
300 blackout will probably be the route i take for swapping. Is the bolt carrier group compatible? Yep. Only thing different is the barrel. Check out the AR Variants section of the forum. It pertains specifically to ARs in rifle calibers other than 5.56. There is a FAQ for most common calibers. Most questions are already answered there. Read into the 6.5 Grendel and 6.8 SPCII for hunting too. 5.56 works great for self defense. There is a tacked thread in the ammo subforum on best ammo for self defense. Read up there too. |
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Quoted:
Hey if you want a good round that uses the same bolt group and is 308 . Take a look at the 762x40 Wilson tactical .. Beats the 300 Black out and the 6.8 easy swap too.. even use the 223case.. $250.00 for the barrel. Good for Der and Elk here in Colorado. locodriver Good luck finding ammo with 7.62x40. Unless you reload this caliber would not be something I would suggest. Of course the same could be said for 300 Blackout but at least more than one manufacturer is producing the stuff. |
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Every now and again a guy at the office talks about getting a .300 AAC Blackout. I personally don't see it. For one thing- unless you reload- well, at least here, you can't pick up ammo for it locally. Secondly- basically a .300 AAC BLK uses a similar sized cartridge- the parent cartridge - is a .223 remington- which means that it packs the same amount of gun powder- i.e. you don't have extra gunpowder to push the heavier bullet- so it just travels slower. So, you end up with the same amount of energy coming out of two dissimilar rounds. Me, I want it to be an upgrade in power; even a 7.62x39 only offers about 20% or so more energy out of the its round when compared to 5.56.. 7.62x51 - gives a nice boost. At longer distances- I believe that the 300 blackout suffers from more drop than the puny 5.56... Kind of like lobbing a round down range..
To me, I think a .300 AAC Blackout has it's place- closer distances perhaps... To me, logically, it's not a more powerful round- it's a different round that is optimized for closer ranges and for short barrels ( for use with suppressors ) -- i.e. for CQB. Personally, if I were the OP, I'd opt for getting two different rifles- one in 7.62x51 and one in 5.56.. Depending upon the use- it's probably a better alternative for most people, and provides you with two weapons rather than 1 1/2 .. I just don't see a lot that interests me in the .300 AAC Blackout. Get tired of one or the other- sell it as a whole rifle. Having two rifles to me is better than 1 1/2... |
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Quoted: I apologize for my misconception, I now realize the reasons it wouldn't work. I do like the idea of having a .300 black to swap in though as I don't feel the .223 rem would be entirely sufficient to defend against a person or take down a fairly large sized game. Obviously tthe .223 is much more logical for plinking/hunting squirrels or foxes as ammo is sufficiently available and cheaper. Seriously? You know how many people 5.56 has killed? Mil can't even use any of the fancy soft-tip or open-tip heavier grain ammo you can. |
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Quoted:
Seriously? You know how many people 5.56 has killed? Mil can't even use any of the fancy soft-tip or open-tip heavier grain ammo you can. Quoted:
Quoted:
I apologize for my misconception, I now realize the reasons it wouldn't work. I do like the idea of having a .300 black to swap in though as I don't feel the .223 rem would be entirely sufficient to defend against a person or take down a fairly large sized game. Obviously tthe .223 is much more logical for plinking/hunting squirrels or foxes as ammo is sufficiently available and cheaper. Seriously? You know how many people 5.56 has killed? Mil can't even use any of the fancy soft-tip or open-tip heavier grain ammo you can. Yes they can. This is a common misconception that is attributed to the Geneva Convention, but it's actually not. Research military ammo like the Mk 262 I mentioned earlier. I believe there is also some use of the Barnes triple shock in 70 and 50 gr varients, and the 7.62 M118LR (the standard US sniper round) is a 175 gr open tip match. |
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Quoted:
Every now and again a guy at the office talks about getting a .300 AAC Blackout. I personally don't see it. For one thing- unless you reload- well, at least here, you can't pick up ammo for it locally. Secondly- basically a .300 AAC BLK uses a similar sized cartridge- the parent cartridge - is a .223 remington- which means that it packs the same amount of gun powder- i.e. you don't have extra gunpowder to push the heavier bullet- so it just travels slower. So, you end up with the same amount of energy coming out of two dissimilar rounds. Me, I want it to be an upgrade in power; even a 7.62x39 only offers about 20% or so more energy out of the its round when compared to 5.56.. 7.62x51 - gives a nice boost. At longer distances- I believe that the 300 blackout suffers from more drop than the puny 5.56... Kind of like lobbing a round down range.. To me, I think a .300 AAC Blackout has it's place- closer distances perhaps... To me, logically, it's not a more powerful round- it's a different round that is optimized for closer ranges and for short barrels ( for use with suppressors ) -- i.e. for CQB. Personally, if I were the OP, I'd opt for getting two different rifles- one in 7.62x51 and one in 5.56.. Depending upon the use- it's probably a better alternative for most people, and provides you with two weapons rather than 1 1/2 .. I just don't see a lot that interests me in the .300 AAC Blackout. Get tired of one or the other- sell it as a whole rifle. Having two rifles to me is better than 1 1/2... its pretty apparent you do not understand ballistics . please dont offer advice to new members until you actially understand what your talking about . issac newton would be a good author to read. pay attention to the formulas for energy. |
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Quoted:
Seriously? You know how many people 5.56 has killed? Mil can't even use any of the fancy soft-tip or open-tip heavier grain ammo you can. Quoted:
Quoted:
I apologize for my misconception, I now realize the reasons it wouldn't work. I do like the idea of having a .300 black to swap in though as I don't feel the .223 rem would be entirely sufficient to defend against a person or take down a fairly large sized game. Obviously tthe .223 is much more logical for plinking/hunting squirrels or foxes as ammo is sufficiently available and cheaper. Seriously? You know how many people 5.56 has killed? Mil can't even use any of the fancy soft-tip or open-tip heavier grain ammo you can. This....223 is not a toy round if you hit someone with it then it's no joke, it's certainly not a plinking round. |
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Quoted:
I apologize for my misconception, I now realize the reasons it wouldn't work. I do like the idea of having a .300 black to swap in though as I don't feel the .223 rem would be entirely sufficient to defend against a person or take down a fairly large sized game. Obviously tthe .223 is much more logical for plinking/hunting squirrels or foxes as ammo is sufficiently available and cheaper. You should try plinking a squirrel with .223. 
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