Rear sights are fully adjustable but the front post can also be used for finer elevation adjustments if needed. The Carbine barrels are not markedly different in construction but do use the 1 in 7 twist. The rilfes will usually be found with 1 in 7 twist barrels of heavier construction under the handguards and all will use a birdcage flash hider with the bottom 1/3rd or so left solid to cut down on dirt / dust generated when firing prone. When the M16A1 was modified to the M16A2, the Sporter Model became version II.
'SP2" is the common abbreviation for the Colt Sporter II models introduced in 1984 and still (AFIK in the Lightweight Sporter model only) sold today. These rifles almost always perform best with bullet weights no greater than 55 grains. They are lighter due to use of a thinner barrel and lighter weight polymer stocks. Rear sights are windage adjustable only with elevation adjusted via the front post and most will have the 'birdcage' flash hider as used on the M16A1 (older models may be found with the three pronged flash hider). They use a 1 in 12 twist barrel and do not usually incorporate a forward bolt assist. In general, where the commercial Colts are concerned, the SP1 indicates rifles and carbines made from 1964 through 1985.
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