Jimmy,
I had a little Winchester M24 in 20g and gave it to my brother-in-law. It weighs just under 6lbs. He couldn't hit anything with it. His shooting skills were not all that mature at that point. Frankly, I didn't do so great with it either. I added some adhesive backed car wheel weights to the underside of the barrels at the muzzle. I think it was only a couple ounces or less. What a difference! It's all out at the muzzle and changes the balance and inertia of the gun dramatically.