military, with variants used as sniper and designated marksman rifles, accurized competition weapons, and ceremonial weapons by honor guards, color guards, drill teams and ceremonial guards. The M14 rifle remains in limited service in all branches of the U.S. It was replaced by the M16 assault rifle, a lighter weapon using a smaller caliber intermediate cartridge. The M14 was the last American battle rifle issued in quantity to U.S. Army, Navy, and Marine Corps for basic and advanced individual training (AIT) from the mid-1960s to the early 1970s. Marine Corps by 1965 until being replaced by the M16 rifle beginning in 1968. military in 1959 replacing the M1 Garand rifle in the U.S.
It became the standard-issue rifle for the U.S. The M14 rifle, officially the United States Rifle, Caliber 7.62 mm, M14, is an American selective fire battle rifle that fires 7.62×51mm NATO (.308 in) ammunition. BTW, I'd buy a 6720 in a heartbeat if I could find one with the proper front sight base.An M14 rifle shown with a 20-round magazineīattle rifle, automatic rifle, sniper rifle, semi-automatic rifleġ959–1964 (as the standard U.S. Or so I have been told as I've never actually seen one. For some reason only a very small handful have been manufactured with the true "F" marked front sight base. The reason for the lack of the "F" marking on most of them is due to Colt using standard light-weight 6520 barrel assemblies made for the standard A2 fixed handle upper. To answer your other question: The parts on the 6720 ARE mil-spec and gauged and inspected. To the OP If the 6720 you bought does not have the "F" marked sight base you will have to get a higher, non-standard, front sight post to get a true zero elevation. Though I have seen a few further up on the reinforcing tab just below the sight ears. It's usually stamped on the gas tube mount bar someplace. To find the "F" mark on your sight base look on one side or the other. The older fixed carry handle/sight base upper receivers are a different height reference for zero. The "F" marked front sight housing is needed due to the flat-top configuration (Hence the "F" mark) for proper elevation zeroing. I wouldn't let that alter your decision, especially considering that all the ones you are looking at probably do have the F mark.
In short, the F mark may affect where the rifle zeroes along the vertical, but it's fixable if wrong in either direction. I ended up just buying a rifle with a fixed carry handle upper to scratch the itch, but it's a carbine length and not rifle, so maybe someday. If you somehow get a short FSB on a carbine, there are taller sight posts on the market, it's easy enough to get around.Īt one point I wanted to build a fixed carry handle rifle length upper (I have a stripped upper tucked away somewhere), it proved difficult to find a FSB that did NOT have the F mark on it. I'm unclear on the how it works, but apparently the shorter barrels (16 and under) need a slightly taller front sight compared to the rifle length models. Where would one look to find the "F" marking?The "F" marking means the FSB is slightly taller. Where would one look to find the "F" marking? So the 6720 is only batch tested and not mil spec? Good luck in your quest.Now I'm confused 🤷*♀️ I can't speak for the other manufacturers mentioned. All the Colt M-4s have it and about 90% of the AR-15A4s do as well. Whatever you buy, if it's a flat-top upper, be sure it has the "F" marked front sight housing for proper elevation zeroing. The issue with mid-length rifles is non-standard proprietary parts which are frequently difficult to find. A Government weight 20 inch barrel, again, all mil-spec and inspected parts, flat-top upper as on the M-4. If you want a longer barrel and more to hang onto, go with the Colt AR-15A4 rifle. The 6721 is a fine rifle with an H-Bar 1/9 twist barrel. But I've been told the same thing about Unicorns. The 6720 is a light-weight flat-top but I've never seen one with the proper "F" marked front sight base, though I've been told they DO exist. The one drawback is the fixed carry handle/rear sight base makes a low-profile optic mount damn near impossible. The 6520 is a fine rifle if you want a truly light-weight carbine. IMHO, it's better to have parts quality than cosmetic finishes. These are working rifles and not safe queens. Not just batch tested but each one installed. All load bearing parts (barrels, bolts, bolt carriers) are magnetic-particle tested. Mil-spec and all parts are gauged and inspected.
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