Can you interchange uppers?

[Alldowntheline]

I've got a basic Bushmaster A2 frame, can I get different uppers and exchange them on the same frame? Is this legal? What do you know about this subject???

[tpiini]

I've switched uppers on several of my Bushmasters several times. The only legal restriction is that you can't put scary-looking uppers on post-ban lowers.

[CJan_NH]

I switch uppers all the time on my ARs and it's perfectly legal (and safe) with a few caveats:

-You cannot legally install a preban upper on a postban lower.

-You can legally install a postban upper on a preban lower.

-If you have a large pin Colt upper/lower and want to install it on a small pin upper/lower you will need an adapter

My preban 6601 Colt HBARs have the nicest triggers of all of my ARs. For this reason I use these lowers more than the others. Frequently I go to the range with one of these lowers attached to a 16" CAR or M4 upper.

Here is a pic of my four Colts-I mix and match the uppers all the time :)

http://home.comcast.net/~cjan99999/Colts.JPG

The M4 carbine (second from bottom) is a postban so I can't mount anything but a postban upper on that lower. Aside from that though anything goes ;)

[Alldowntheline]

Sounds good!