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Author Topic: Building an AR-15 in 450 Bushmaster  (Read 7502 times)

Offline MI_Bowhunter

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Building an AR-15 in 450 Bushmaster
« on: February 10, 2017, 09:29:03 AM »
Well, I finally decided to pull the trigger and buy a barrel and bolt in 450 Bushmaster. I'm going to be building a hunting gunaround it and trying to keep it fairly low budget.

Barrel and bolt should arrive next week and the real fun will begin.

I did not spend the extra $$ on a 450BM receiver so there will be a little machining to open up the ejection port for the larger brass.

Power tools and guns, what could possibly go wrong?

For those unfamiliar with AR-15 assembly I'll post pics as I go. Feel free to ask any questions you have

Might even mill out an 80% receiver just to make it even more interesting!!

Buckle up, this is going to be fun!
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Offline MichiganLouie

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Re: Building an AR-15 in 450 Bushmaster
« Reply #1 on: February 10, 2017, 01:57:06 PM »
Looking forward to see what you come up with.
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #2 on: February 10, 2017, 03:42:35 PM »
Looking forward to see what you come up with.
Me too!!   LOL
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Offline BubbaBrown

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Re: Building an AR-15 in 450 Bushmaster
« Reply #3 on: February 10, 2017, 04:26:20 PM »
Great, give us the step by step build. I'd love to do the same, but don't think I have the tools for it ()*$%RT
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Offline yari

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Re: Building an AR-15 in 450 Bushmaster
« Reply #4 on: February 10, 2017, 04:52:47 PM »
sounds like you are getting ready for our pig-o-rama
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Offline Madgomer

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Re: Building an AR-15 in 450 Bushmaster
« Reply #5 on: February 10, 2017, 07:01:34 PM »
MI-B - I'm definitely interested in hearing more as you go forward with this.  Have been thinking about building up a big-bore thumper but haven't pulled the trigger on it yet (have two new stripped lowers & uppers just waiting to be built up though).  Will be curious to see what you need to do on the ejection port - are you diving in to that by trial & error, or have you found some good guidance on it?  One of my stripped uppers is a slick-side with no forward assist boss or dust cover mounting - that might be the place for me to start on one of these builds.
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #6 on: February 10, 2017, 07:47:48 PM »
Great, give us the step by step build. I'd love to do the same, but don't think I have the tools for it ()*$%RT

The only specialized tool you need is a barrel nut wrench and they are available pretty much anywhere ARparts are sold.   Some hand guards require a special wrench but the majority will use the std tool.  Everything else can be done with std home tools.

sounds like you are getting ready for our pig-o-rama

It will definitely work for that.   My primary intended use is for deer.   The lower half of lower MI is designated a shotgun only zone for deer hunting (some pistol calibers and muzzle loader are allowed).  A couple years ago they expanded it to allow certain straight walled cartridges to be used in rifle form.  My primary hunting location when I hunt in this area is over a corn/bean field.    This will extend my range a bit over a shotgun or my muzzleloader. (Plus it's just fun to put together guns  ;D )

MI-B - I'm definitely interested in hearing more as you go forward with this.  Have been thinking about building up a big-bore thumper but haven't pulled the trigger on it yet (have two new stripped lowers & uppers just waiting to be built up though).  Will be curious to see what you need to do on the ejection port - are you diving in to that by trial & error, or have you found some good guidance on it?  One of my stripped uppers is a slick-side with no forward assist boss or dust cover mounting - that might be the place for me to start on one of these builds.

I've been doing some research and lurking on a 450BM specific forum and have picked up a lot.   The port needs to be opened up a small amount along the lower edge and a little along the top towards the rear.   If you wish to continue using the dust cover you have to careful not to remove the material where it latches.   I orderred my barrel, bolt (not including carrier) and thread protector from Tromix Lead Delivery Solutions.    They also sell stripped uppers,( already modified), gas block, compensator, etc as well as complete uppers.   They wanted $135 for a 450BM upper, my Anderson cost $44.  I've rather save the money or apply it elsewhere where it I will get more out of it such as trigger.

As this will likely be shot from a ground blind I opted to go without a comp.  Yes they reduce recoil but they are also LOUD, esp where the sounds can bounce off a nearby wall, etc.   I doubt the recoil without it will be much more than a small shotgun so I am not too concerned about recoil on this one.

I already have a carrier for the bolt, scope, charging handle and a extra completed lower so that eliminated a lot of expense right off the top. To spice it up I may finish off a 80% lower I have had sitting here for a while.  This is an aluminum lower and I have the jig and machine bits to finish it with a router.
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Offline BoBallistic

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Re: Building an AR-15 in 450 Bushmaster
« Reply #7 on: February 11, 2017, 08:03:21 AM »
MI - Great build, always had respect for the 450 Bushmaster! One great bear rifle....and deer and almost anything else you might want to take with it would make a pretty darn good home defense round as well...LOL...

Keep us all informed of your progress...should be an interesting build...
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #8 on: February 12, 2017, 08:54:48 PM »
The parts I needed to complete the upper arrived on Saturday.  I'll start posting some pics tomorrow and get this thing rolling.
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Offline Foss1lHunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #9 on: February 13, 2017, 01:30:34 PM »

How is the recoil with the 450BM?  This is new to me. 

I considered building a 6.8 or .308 before I settled on .300 AAC.
I purchased pretty much barrel and complete upper to make it an easy swap and ended up with all the tools necessary for my next build.                                                   ()*$%RT                 ()*$%RT                       ()*$%RT                ()*$%RT
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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #10 on: February 13, 2017, 02:45:52 PM »

How is the recoil with the 450BM?  This is new to me. 

I considered building a 6.8 or .308 before I settled on .300 AAC.
I purchased pretty much barrel and complete upper to make it an easy swap and ended up with all the tools necessary for my next build.                                                   ()*$%RT                 ()*$%RT                       ()*$%RT                ()*$%RT
I'll let you know when I finish it. I have honestly never shot one.  From what I have been told, the recoil is approximate to a 20g shotgun. That really doesnt tell me much but I figure it has to be less than that of a 12g slug. LOL
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Offline BLUETOE

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Re: Building an AR-15 in 450 Bushmaster
« Reply #11 on: February 13, 2017, 04:05:25 PM »
Sounds great!! keep us posted  as you go sounds very interesting.
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Offline dave 1211

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Re: Building an AR-15 in 450 Bushmaster
« Reply #12 on: February 13, 2017, 05:27:15 PM »
wish we could that in new York state but noooooooooo
 
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turkey season is 1 month away





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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #13 on: February 13, 2017, 05:49:52 PM »
OK Here are some pics:



All the parts laid out.   Some I just bought, some I already had.    I reserve the right to change up any of these as I go.   ;D

The gun in the background is my 300BLK that I built a while back.



Matrix Arms Keymod Handguard.  This is a friction fir free floating tube.   The barrel nut that comes with it is different than any I gave seen.  I will have to find some other way to torque this one down.  It has flats on four sides, I have not determined size yet.



Barrel stamp.  I was impressed that this barrel already has a detente hole under the gas port.  I will add a second but this is the first I have seen to come with one.    I will expand on this later in the build.

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Offline MI_Bowhunter

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Re: Building an AR-15 in 450 Bushmaster
« Reply #14 on: February 13, 2017, 05:57:20 PM »


Looks like they took a std M4 barrel extension and ground it down to make the 450 feed ramp.



Here I just laid everything together to give you an idea how it will look when it is done.   Not really assembled but enough to see what it will look like.



Closer look.

There really is not much to putting together an upper.  This one is only made more difficult because I need to mill out some of the metal around the ejection port for the larger 450BM brass.

Next I'll take it all apart and go through the details of assembling it for real.   I am still trying to figure out exactly how I want to tackle opening up the ejection port.   Look to borrow a cross slide vise I can can be more precise in milling away the metal.  I'll keep you posted.
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