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free floating the barrel has to do with the handguards, nothing to do with the barrel
but for this step you need to figure out;
caliber (556, 5.45, 300blk, 7.62 etc)
lined/unlined(chrome, melonited, NIB, chrome molly, etc)
length of barrel (7-24")
length of gas system (pistol, carbine, mid, rifle)
rifling twist rate (1/7 thru 1/12)
profile (pencil, gov, m4, heavy, target, bull etc)
generally noveske and white oak barrels are considered the best. DPMS makes pretty good ones for the price.
You really should pick an intended purpose with priorities given to longevity, accuracy, weight etc
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