Hello, I have a new website walshgunandtackle.com where there is Bushmaster 450 bushmaster uppers,ammo,mags on sale and 1,000's of other items are listed.
Here is a link to the 20" 450 upper http://walshgunandtackle.com/product.sa ... f-mag-2070
16" 450 upper here http://walshgunandtackle.com/product.on ... f-mag-2070
any questions email or call Scott Walsh #1-989-856-4465 thanks!