I've considered building an AR in .223 and have been thinking about barrel length. Most everybody seems to make 16" or 20" barrels. I've got an SU16 with an 18" barrel and kind of like it as a compromise length. So who makes AR uppers in 18"?
The Bushmaster Predator is offered with an 18" barrel. RRA also offers some 18" barrels. Pretty much any of the custom shops will offer you an 18" AR barrel with your specifications.
18" is the length used on the SPR version of the AR, so there are actually quite a few 18" offerings out there.
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