you can buy aluminum rail blanks of ebay, pre powdercoated, reasonably cheap.
Alternatively, with so many polymer rail handguards out there now, you can get a polymer rail bits from any one of those handguards (maaaaahgpuuuull MOE) and have a bit of an easier time filing.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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