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Old 11-22-2019, 10:03 PM
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Xi Bowhunter Xi Bowhunter is offline
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Default Building a 450 bushmaster on an ar platform?



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Does anyone have any info, help, or tips to building a 450 bushmaster on an AR platform?

Please note that I have never built one before.

Would it be simpler to build a .308 on the AR platform? Iím not opposed to that either.
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Old 11-22-2019, 10:15 PM
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Quote:
Originally Posted by Xi Bowhunter View Post
Does anyone have any info, help, or tips to building a 450 bushmaster on an AR platform?

Please note that I have never built one before.

Would it be simpler to build a .308 on the AR platform? Iím not opposed to that either.
The 450 Bushmaster works with standard AR15 lowers and parts. The .308's are built on the larger AR10 platform, which is not quite as standardized as the AR15.

Having said that, the two cartridges are vastly different with different uses and capabilities, the .308 being far more versatile. But only you know what your needs are.


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Old 11-23-2019, 01:27 AM
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simpler to build a .308 on an AR platform? yeah it would be, since parts are readily available, and pretty common for .308 ARs (DPMS or AR-10 pattern).. on the AR-15 platform though you wouldnt be able to do this.. so if you want a project that HAS to be on an AR-15 lower, you cant use the .308

the only areas to really consider a .450 bushmaster or 458 socom would be if you were planning to hunt big game at close range in very, very thick brush
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Old 11-23-2019, 08:02 AM
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If you already have an AR15 lower. Its easy. As in get a 450BM complete upper, 450 bcg or bolt and a 460BM magazine or convert a steel magazine with a 450 follower.

If you want to build a 308 you'll have to start with a lower and buy the rest.

450 would also be cheaper to build by like $100-$300 depending on parts used.
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Old 11-23-2019, 08:42 AM
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For a lot of reasons, in threads here and elsewhere
I went with .458 SOCOM
Regardless, unless you like to build uppers,
Just buy a complete upper and mags that compensate for the suboptimal design of the Bushmaster case
Pretty simple
Does not cost much
Unless you need a little more range and energy, consider the .458 SOCOM
No stupid design flaws
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Old 11-23-2019, 11:47 PM
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Ar 15’s lowers are cheaper and easier to build. Then buy an upper. I built a lower and then bought a 16” 450 bushmaster with bcg and one mag for under $250 shipped. 308 was much pricier.
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Old 11-24-2019, 12:13 AM
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what really is the difference between a .450 bushmaster and .458 socom? performance seems pretty close to eachother, the .450 isn't necked down so likely has a larger base diameter allowing for higher pressures to compensate.. can either of them use brass that is more common? is one of them better with a particular type of magazine?
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Old 11-24-2019, 05:22 AM
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The 450 Bushmaster shoots smaller lighter bullets at higher velocity
.452" caliber bullets. It has more range, not a lot but more, and more energy not a lot, but more. Runs at 38.5 k psi
Magazines need a modified follower

The .458 SOCOM shoots larger bullets up to 600 grains plus
.458 caliber bullets, from sonic to subsonic
Standard magazines work but there are magazines with followers for heavy bullets
Runs at 35k psi.

"As noted above, the cartridge was designed to be 100% compatible with the M4 platform. This included the buffer, buffer spring, NATO magazines, many aftermarket .223/5.56 magazines, and magazine well. In .223/5.56 caliber, cartridges stack in a staggered (double stack) fashion. However, with the much larger .458 SOCOM, rounds "single stack" without any modification to the standard GI magazine feed lips or follower. A standard 20-round 5.56mm NATO magazine can hold seven .458 SOCOM rounds and a standard 30-round 5.56mm NATO magazine can hold ten .458 SOCOM rounds."
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Old 11-24-2019, 11:46 AM
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Lowers can be assembled with not much more than a nail to drive the roll pins.

Uppers require some special tools to install the barrel without risking damage to the receiver. Unless you have access to the tools just buy an assembled upper.

(my $.02, it is worth what you paid for it.)
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Old 11-24-2019, 11:53 AM
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investigate the 350 legend before you invest

faster, flatter shooting. enough power to whack an elk.

those .45X cartridges don't have the range for out west shooting. like a midget boxer, plenty of punch for a short distance, no reach.
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Old 11-24-2019, 12:23 PM
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Quote:
Originally Posted by justin22885 View Post
simpler to build a .308 on an AR platform? yeah it would be, since parts are readily available, and pretty common for .308 ARs (DPMS or AR-10 pattern)..
There you go again, expertly commenting on things you have zero knowledge or experience with.....

The 450 BM uses AR15 parts, which are more standardized, cheaper, and far more available than AR10 parts. The only thing unique is the barrel and bolt, the bolt carrier is the same. The ejection port needs to be slightly relieved with a dremel, or one can buy an upper already enlarged. Replacement mag followers can help with any feeding issues.

There are many reasons to choose an AR10 in .308 over a 450 BM. Being "simpler" to build is not one of them.

Stick with Makarov threads Justin. I get the impression you've at least seen one of those.....


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Old 11-24-2019, 01:02 PM
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Quote:
Originally Posted by HappyinID View Post
There you go again, expertly commenting on things you have zero knowledge or experience with.....

The 450 BM uses AR15 parts, which are more standardized, cheaper, and far more available than AR10 parts. The only thing unique is the barrel and bolt, the bolt carrier is the same. The ejection port needs to be slightly relieved with a dremel, or one can buy an upper already enlarged. Replacement mag followers can help with any feeding issues.

There are many reasons to choose an AR10 in .308 over a 450 BM. Being "simpler" to build is not one of them.

Stick with Makarov threads Justin. I get the impression you've at least seen one of those......
so what you are saying is you dont have to buy non-standard bolts, barrels, or magazines for .450 bushmaster that will be less common and more expensive than standard parts?
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Old 11-25-2019, 02:14 PM
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Originally Posted by justin22885 View Post
so what you are saying is you dont have to buy non-standard bolts, barrels, or magazines for .450 bushmaster that will be less common and more expensive than standard parts?
The bolt, barrel, and magazines for an AR10 are all more expensive and less available than standard AR15 parts, along with much of the rest of the gun.

Quit while you're behind Son....
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Old 11-25-2019, 05:34 PM
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Quote:
Originally Posted by Xi Bowhunter View Post
Does anyone have any info, help, or tips to building a 450 bushmaster on an AR platform?

Please note that I have never built one before.

Would it be simpler to build a .308 on the AR platform? I’m not opposed to that either.
By the term " build", are you stating that your plan is to build per component down to the roll pins or is this an assembly affair using complete uppers and lowers?

If it is the former, then a 450BM build from scratch would mean parts would be easy to find and build itself would be a bit more simple. ( Reasons: Glance back to HappyID posts here as there is no reason for me to type it out again because he is 100% on point )

If you are buying a complete upper and lower too slap together, then its a dead tie in regards to how simple either is to accomplish. ( Takes a bit longer to strap up a sling on either for comparison......and both are very simple to get done.)

Either case.......my vote = build or assemble both.

If you must choose between the 2, 308 is by far the more versatile cartridge. ( As HappyID also pointed out.

Too add to it a bit.....and simply to give you a bit more info before you lighten the wallet........

1. Loaded 450bm cartridges weigh more than the same number of 308 cartridges do.
2. 308 = less felt recoil ( AR10 types run a bit heavier than AR15 types)
3. Ammo capacity via std cap mags goes towards 308. ( 20rd std and 25rd highs via 308 vs 9 round 450bm or 458socom in a std cap Ar15 30rd mag by length)

https://palmettostatearmory.com/asc-...-bm-b-asc.html

Note: Pics below show the differences between a 30rd AR magazine ( 9rds once modified to run reliably...if at all via the thumpers......vs a 20rd M14 magazine which is one of the most reliable designs ever made , and made specifically for 308 and run reliably in the actual AR10B once modified.)

4. 308 gives you a much larger selection of different factory loads and reloading components, and it costs less to build up a stockpile via either / both.
( Examples: FMJ, match, tracer, subsonic, mouse fart, varmint, AP, plastic training, blank, and hunting cartridges that are designed for specific game in mind from deer, hogs, bear, elk and moose.

Again.....I say you should build both , have fun, and learn firsthand regarding versatility.
If you can't......the short and sweet answer = the 450bm takes care of a scratch ...not a niche. 308 takes care of everything else.

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Old 11-25-2019, 05:49 PM
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On a side note to the op. .....

If you ever decide to build something along the lines of the 450bm rifle in below link.............

https://www.buladefense.com/product/bds-450/

Please let me know, as I will not only help you in any way I can, but name my first born after you ( He wont like that much but fair is fair...lol)

.......And you are welcome to blast away with one of my 7.62x51mm version s in pic below provided that you let me do the same with an M14 thumper.

Note: That would be one heck of an itch I would love to scratch, but I have no honest to Abe practical reason to build one myself in any realistic light.

Edit: Im kidding.....maybe
And apologies to HappyinID, as I mis typed his user name earlier.
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