[ARCHIVED THREAD] - 450 Bushmaster Build Help

Posted: 10/8/2015 7:28:17 PM EDT

I am looking for some pictures and measurments of the ejection port, as I need to open up the ejection port for the 450 cartridge. Thanks

Posted: 10/8/2015 9:21:51 PM EDT

[#1]

http://www.450bushmaster.net/viewtopic.php?f=2&t=12877

This is the best info I have found. I'll be cutting mine with a mill this weekend. I picked up a Palmetto State blem upper to hack on

Posted: 10/9/2015 4:12:52 PM EDT

[#2]

I used a CMT upper for mine. Aero also sells a .458/.450 compatible upper
It's got the correct size ejection port

http://www.aimsurplus.com/product.aspx?item=XCMTUPUR3&name=CMT+UPUR-3+Billet+Slick+Side+Upper+Receiver&groupid=4779

Posted: 10/9/2015 4:57:40 PM EDT

[#3]

Quote History

Quoted:
I used a CMT upper for mine. Aero also sells a .458/.450 compatible upper
It's got the correct size ejection port

CMT UPUR-3 Billet Slick

View Quote

Made hot. AIMSurplus has always been good to me BTW. Site sponsor as well.

Posted: 10/9/2015 5:03:54 PM EDT

[#4]

Thanks for the info, but looking for a picture of a factory Bushmaster or Remington R-15 upper.

Posted: 10/9/2015 5:37:57 PM EDT

[#5]

This image is inverted:

Posted: 10/9/2015 10:46:18 PM EDT

[#6]

It doesn't take much I just angle the bottom and trim ahead of the catch just like the picture.

Posted: 10/10/2015 4:35:18 PM EDT

[#7]

Thanks to LRRPF52 & Easy_E for the pictures, you didn't need to remove any from the bottom?

Posted: 10/10/2015 5:25:45 PM EDT

[#8]

Nope just on the top into that curve a bit.

[ARCHIVED THREAD] - 450 Bushmaster Build Help

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[ARCHIVED THREAD] - 450 Bushmaster Build Help

[ARCHIVED THREAD] - 450 Bushmaster Build Help