Pennsylvania Zouaves.

[Robert Gray]

This tintype in the collection at the Metropolitan Museum of Art shows Pennsylvania zouaves in the field. Although unidentified, the uniform jackets look similar to those worn by the 72nd Pennsylvania ("Philadelphia Fire Zouaves") and the 95th Pennsylvania ("Gosline's Zouaves"). The soldier in the foreground is holding an Enfield musket. The 95th regiment carried Springfields, so I'm guessing this photo is of the 72nd Pennsylvania.

 

[Old Soldier]

If you display any tintype or ambro-type best way is to flip it. They are mirror images - hence the rifle with the lock on the wrong side. By all means show the original, but it looks far better this way.
Flipped - with a very quick clean up:

(He moved his back foot slightly during the exposure - it is a blurr, not a 'clean-up job')

Rifle certainly looks like an Enfield P53 - complete with a dry-firing nipple protector attached!

 

[Falco1863]

Based on the dark blue trousers and vests, this is the 95th PA.

 

[repman66]

Its the 72nd ---

 

[JOHN42768]

Uniform sure didn't want for buttons

 

[Old Soldier]

Uniform sure didn't want for buttons

Few of which were actually used. Fashion strikes again!