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Hi Mike, not a silly question at all. You cannot load or fire 5.56 from a gun chambered in 5.7 x 28mm Stay safe & have a great day!
Hi Mike and welcome. Unfortunately, no Sir. 5.56 and 5.7 are vastly different sized rounds as pictured here: 5.7 on the left and 5.56 on the right: https://www.gunmade.com/57-28-vs-223/ --- Cheers and stay safe!
Good evening to you!! That is a definite no. Bullet and cartridges are completely different. Hope this helps you. Have a good rest of your day.
Not a silly question, we all started somewhere not knowing things. But, You definitely Cannot chamber/shoot 5.56 out of a firearm chambered for 5.7×28mm.