Thanks Nyles for explaining the difference between .223 Rem and 5.56 NATO.
We had a PD bring in their Bushmaster built carbines with stainless steel barrels as they would not function on Full Auto firing 5.56 NATO. We had to go in with a 5.56 NATO chamber reamer and give them the correct chamber for the cartridge. Once that was done they worked perfect in Full Auto mode.
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