![]() ![]() You need to watch that you don't cover the gas port and thus have the block rotated correctly. ![]() Tools required: Front site tool, taper reamer, drill soft hammer, block of wood or something capable of uniformly knocking the FSB into place. The F-marked FSB are for A3/A4 uppers where you're installing some flip-up or similar peep sights. The 'Non-F-marked' are for uppers with built-in carry handles.LaFrance of La France Specialties of San Diego, California. The M14 rifle, officially the United States Rifle, Caliber 7.62 mm, M14, is an American. All AR-15/M16 barrels with a 0.750" or 0.625" gas tube section of the barrel (especially those with taper pin holes) Sights, Aperture rear sight, barleycorn front sight.Available for 0.625 or 0.75" diameter gas block'd barrels.Sometimes called the FSB (Front Sight Block/Base).We offer an F-marked, 0.75" version that has the sling swivel pre-installed (swivel not shown in photos). This translates to a difference of only 6 clicks assuming you're using the common 4-notch front sight post so it might not matter if you have enough adjustment room on your Front Sight Post. Non-F-marked Front Sight Blocks (sometimes called the Standard or A2 version) are intended for the classic A2 carry handle receivers. The difference between F-marked and non-F-marked is a very small difference in height, the 'deck' on the F-marked FSB is 0.04" taller, intended for Flat-top upper receivers. She's pretty fresh and will need you or your smith to drill and ream the taper holes for installation. This is your standard A1 or A2 height Front Sight Block/Base (FSB). This brings back memories don't it? Ah the good old days when AR's were simple and not quite the lego that they are today. ![]()
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