The Heavy Taper Barrels in 5-1/4" and 6-7/8" have a front sight unique to them, the adjustable rear sight is like all other Mark rear sights. The pictures below show obvious differences. The 5-1/4" is collectable and best not messed with.










RUGER MARK SERIES
Receivers & Barrels
EVERYTHING you could possibly want to know,,,,
If I'm missing anything, have something wrong
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RECEIVER (FFL part of the pistol) BARREL ASSEMBLED UPPER
LITE is One Piece "Tensioned" ALL MK3 had an LCI Slot MK1, 2, 4 did not have LCI Slot
There are various After Market Uppers that COULD be on your pistol and even
AMT made a Copy of the Mark II Pistol that parts interchange,, SO,, Don't
ASSUME the upper that is on your pistol is what came on it.

A Ruger upper SHOULD always say "Ruger" on it unless someone removed
the wording.
Click on any picture to enlarge it.
Standard Taper Barrels (Pencil Barrels) in 4-3/4" and 6" did not come from factory with adjustable rear sight and the front sight is too short to accommodate an adjustable rear sight. You will need a taller front sight if wanting an adjustable rear sight. The standard adjustable rear sight will fit this dovetail slot. NOTE Very early Standard pistols used a narrower dovetail and they are collectable, best NOT to mess with it.










The Ruger LITE pistol barrels are a full 1" diameter and use a SHORTER front sight than the steel Bull barrels do.









The 10" Ruger Mark II pistols used a front sight unique to them and the front sights are no longer made. It used a taller sight than the bull barrels since the 10" barrel is slightly tapered.







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