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Plantronics 788 windows 106/16/2023 ![]() Grey phosphate finish - 20 inch length - 0.625' diameter for gas block - A1 'pencil' profile - 1 in 12 twist - Caliber 5.56 NATO - Chrome lined - With gas hole and barrel extension. Perfect for finishing your M16 build project. Original barrel for the M16 A1 marked “C MP-B” on front of barrel, bottom side. By 1942, in a thorough study of bore erosion of guns large and small (from 3″ naval guns to small arms), Burlew noted a report by Russell that considered chrome plate a “bad” material from a bore-erosion standpoint, except “when made very adherent” in that case it was an “excellent” material, roughly five to nine times better. ![]() 20 fnmi mp chrome bore barrel, ar barrel marked fnmi mp chrome bore,, colt ar15 serial number lookup, fn m1 mp barrel, fn m1 mp m16 barrel, fnmi a1 20 barrel, fnmi chrome bore, fnmi mp chrome bore, fnmi mp chrome bore barrel value, fnmi mp crome barrel, whats the twist on dpms.
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