[DaMadman]

Just from my experience. If you put a 3 inch barrel on a 2-3/4 reciever I would ONLY SHOOT 2-3/4 shells for a couple reasons.

#1 the ejection opening in the 2-3/4 gun is shorter than it is on a 3 inch gun

#2 the springs are heavier in a 3 inch gun and if you shoot 3 inch shells in a 2-3/4 reciever it is going to slam the bolt back into the reciever too hard and cause damage.

Those are the 2 main reasons I would NOT shoot 3 inch shells in a 2-3/4 reciever ev3en with a 3 inch barrel installed

Now that being said the answert to your original question is YES
it will work and you can definetly shoot 2-3/4 shells and it should cycle fine and everything should work porperly.

Just stay away from the 3 inch shells.