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I bought a AR-15 in 1993, shot it a couple of times and left it in the safe.
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Lucky you! You now own a preban weapon. Probably worth more than you bought it for unless you got gouged in 93.
The left side of the reciever states it is a Colt Sporter #SL0026XX .223
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That makes the most important part (the lower) an authentic Colt Preban lower.
with a black metal and plastic folding stock,it is 32 1/4" long folded and 35 1/2" extended.
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I can only assume you mean "collapsible" sotck. Have not seen many AR15 folders out there. It should "collapse" on its tube to become shorter..... I believe Colt Sporter lightweight carbines shipped with these on there, should be a 2 or 3 position stock if factory, IIRC.
It has a 16" threaded barrel with a 5" flash suppressor with long slits in the side.
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A 16" barrel with a 5" FH.. for a total of 21"??? That is definitely a parts gun if true. Never seen that one!
If you mean the 11" barrel, with the 5" FH, for a total of 16", then that is more common. I dont know if Colt ever shipped that as a factory rifle... someone else will have to comment on that.
Under the suppressor stamped on the barrel is "CMP 5.56 Nato 1/7".
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That's a Colt barrel.
There is no bayonet lug
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Threaded barrel and no bayo lug screams Colt, in that era.
and the right side of the front sight is stamped SO7 with R1 inside the O. The right side of the upper has "CM" on it. It has a 6" ribbed forearm, black nylon sling with a 9"pad on the sling. The dealer I bought it from stated it was new but did not have a box or papers. Is it a real Colt or was it pieced together?
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I dont know about those other markings. Someone else can comment... If Colt did sell the 11/5.5" Combo as a complete rifle back then, then you have a factory configration. At the worst, what you have is mostly likely all Colt.