450BM help

Talk about the AR15 style rifles chambered in 450 Bushmaster.

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450BM help

Postby Kottonmouth450 » Tue Feb 20, 2018 12:29 am

Hello im new to the AR my 1st build is a 450. I have a 5.56 lower, will i need to get a 450bcg or will the 5.56bcg work with the 450 bolt? Please any help is greatly appreciated
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Re: 450BM help

Postby Al in Mi » Tue Feb 20, 2018 6:18 am

welcome aboard.

450 bolt works with standard carrier.

keep us up to date on your build!!!!
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Re: 450BM help

Postby commander faschisto » Tue Feb 20, 2018 8:45 am

Pics, too...have fun!
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Re: 450BM help

Postby plant_one » Tue Feb 20, 2018 9:45 am

i would suggest getting a whole BCG if its in the budget, and a charging handle too

not that you need to have it, but but it sure is nice to just be able to grab a complete upper and go without having to fiddle with anything.

two pins, swap, done.


you can always buy a bolt, and wait for a complete 5.56 bcg to come on sale cheap (Like one of the <$50 sales), and then you have both a carrier for your 450 and a spare bolt for your 5.56 too :)
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Re: 450BM help

Postby Hoot » Tue Feb 20, 2018 10:25 am

Life's short. If you decide to get a dedicated BCG and 450b bolt to put in it, get a BCG that is either Nitrided or Nickel Boron treated. Yes, they cost a little more but they run really sweet, with easy cleanup. Someone, somewhere always has one on sale. If you have the choice, get the M16 version. They have a little more meat (weight) on them in the rear. More weight makes them easier on the brass. IMHO, avoid BCGs marketed as ultralight or lightweight.

Lest I forget, Image

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Re: 450BM help

Postby plant_one » Tue Feb 20, 2018 10:34 am

Hoot wrote:Life's short. If you decide to get a dedicated BCG and 450b bolt to put in it, get a BCG that is either Nitrided or Nickel Boron treated. Yes, they cost a little more but they run really sweet, with easy cleanup. Someone, somewhere always has one on sale. If you have the choice, get the M16 version. They have a little more meat (weight) on them in the rear. More weight makes them easier on the brass. IMHO, avoid BCGs marketed as ultralight or lightweight.

Lest I forget, Image

Hoot



ya i black friday'ed a nitride BCG for like $53 or something silly.

right to bear has Anderson NiB BCG for $109 right now

https://www.righttobear.com/Anderson-Ni ... nickel.htm

and a basic mil spec m16 bcg in nitride for $80

https://www.righttobear.com/Toolcraft-B ... to-016.htm

or $85 for NiB
https://www.righttobear.com/Toolcraft-N ... 0-c158.htm


hth
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Re: 450BM help

Postby Kottonmouth450 » Tue Feb 20, 2018 10:46 pm

Dam now thats help guys wow thank you. My AR is a complete M16 platform no barrel i could just get a 5.56 barrel and be done but i need the 450BM for deer hunting here in IA and this whole AR is brand new to me. So i jist need the 450BM bolt and barrel and im good. I appreciate the feed back in such a short time :D
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Re: 450BM help

Postby Kottonmouth450 » Tue Feb 20, 2018 11:02 pm

So do i need to change upper receiver then or can it be milled like i said i have complete AR in 5.56 m16 jist no barrel and i want to make it. 450 Bushmaster
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Re: 450BM help

Postby plant_one » Wed Feb 21, 2018 1:55 am

it would depend on the upper itself.

if its a standard generic mil spec upper, you'll etiher need to get a big bore capable one, or get some machining done. the ejection port on a standard 5.56 upper just isnt big enough.


if you could give us some info on the manufacturer of the upper we may be able to help confirm or deny some info for you.
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Re: 450BM help

Postby Hoot » Wed Feb 21, 2018 5:30 am

Here's an image I put up a few years back, of a Bushmaster brand 450b ejection port. Measure the one you have and compare. The important dimension is the vertical clearance.

Image

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EDIT: That image is upside down the cover detent is on top. :roll: Doesn't change the dimensions however.
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