Need help to ID these shorty barrels

[Iraq Ninja]

It has been suggested they are bushmasters. FSBs are not F marked.

The top one is T marked. On the FSB, there appears to be a BOM to the left of of gas tube pin, possibly a 1V before it.

The bottom one is not T marked.

Both have different barrel profiles. They came from a military unit about 2 years ago.

http://i34.photobucket.com/albums/d127/Iraqninja/Gun%20stuff/uppers.jpg

[bkb0000]

my money is on bushmaster for the bottom.. looks exactly like a couple i've had come through my shop here. i don't recall any markings, but i don't recall looking for any- so that helps not.

bushmaster is real big on the bull under the handguards on their shorty barrels.. not sure why..

[scottryan]

Bottom looks to be bushmaster.

Not sure on the top.