RE: Remington A3 03
AT the muzzle, if its an original barrel it should be marked RA (with a flaming bomb under it) with the date (mo-year). An original barrel will have a 4-groove rifling pattern, a replacement barrel can possibly have a 2-groove rifling pattern.
rear sight adjustments- The back of the rear sight will have several small lines and an index line on the bottom. line the '0' line with the index to set to mechanical zero. Each click of the windage = 1 minute. the elevation slider clicks from 100 yards up to 800 yards by clicking it backwards/upwards.
Magazine cutoff- it the lever on the left side below the rear sight- in the up'on' position it will lock the bolt back to prevent you from closing the bolt on an empty magazine- very handy in combat, also handy while shooting matches. in the down 'off' position, it doesn't allow the bolt to go all the way back- can be used with a full magazine to handfeed rounds and keep the magazine in reserve, but also makes for easy singleloading.
There are 3 different stock configurations- straight (being the most likely original conffiguration) scant- used in replacement stocks that has a semi pistol grip, and 'C' which were used mainly on 03-A4 sniper rifles but can show up as replacement stocks on other springfields.
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