Building an AR 450 Bushmaster
Posted: Thu Jan 18, 2018 5:30 pm
I’m thinking of building an AR in 450 Bushmaster. I have successfully built AR’s in 5.56 and .223, but this would be my first big bore.
Background- this year Iowa changed its law to allow a number of straight-walled ‘pistol’ cartridges for deer hunting fired from a rifle. 450B is among the allowed chamberings. I have looked at the Ruger American Rifle, but the word is that its short barrel and flash hider make it extremely loud. At $500 or so, building an AR begins to look way more appealing- and fun.
Some questions, if I may?
My lowers will work, right?
Other parts are standard, like handguard, gas tube, gas block, barrel nut, stock, tube, spring... no need to get special parts for 450B, I think?
I have ‘full auto’ bolt carriers, so I guess I’ll just need to change the bolt itself for 450B.
Where can I get a parts list of the parts that have to be special for 450B?
About the upper receiver? I have a stripped upper. I guess I have to make some modifications? There’s no ejection port Cover, right? And I have to modify the size/shape of the ejection port? How do I do this? To what size and shape?
I don’t really even know what questions I need to be asking?
Background- this year Iowa changed its law to allow a number of straight-walled ‘pistol’ cartridges for deer hunting fired from a rifle. 450B is among the allowed chamberings. I have looked at the Ruger American Rifle, but the word is that its short barrel and flash hider make it extremely loud. At $500 or so, building an AR begins to look way more appealing- and fun.
Some questions, if I may?
My lowers will work, right?
Other parts are standard, like handguard, gas tube, gas block, barrel nut, stock, tube, spring... no need to get special parts for 450B, I think?
I have ‘full auto’ bolt carriers, so I guess I’ll just need to change the bolt itself for 450B.
Where can I get a parts list of the parts that have to be special for 450B?
About the upper receiver? I have a stripped upper. I guess I have to make some modifications? There’s no ejection port Cover, right? And I have to modify the size/shape of the ejection port? How do I do this? To what size and shape?
I don’t really even know what questions I need to be asking?