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Here's my 1975 Colt SP1,great shooting rifle.





 
Posts: 14 | Registered: 26 March 2017Reply With Quote
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Had one just like it back im the 70s sold it.
 
Posts: 17296 | Location: wis | Registered: 21 April 2001Reply With Quote
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Looks like the one with the special pin so you couldn't match an M 16 lower to an SP upper.Logic always escaped me.


Indeed, no human being has yet lived under conditions which, considering the prevailing climates of the past, can be regarded as normal. John E Pfeiffer, The Emergence of Man

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Only one war at a time. Abe Again.
 
Posts: 4211 | Location: Alta. Canada | Registered: 06 November 2002Reply With Quote
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Colt changed the front pin design because the pin was said to be easily lost when tearing down the gun to clean it in the field.
 
Posts: 14 | Registered: 26 March 2017Reply With Quote
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It wasn't logic. In '63 Colt submitted a plan that included nine modifications to the service rifle. The Treasury Dept response stipulated one more change. The front pin needed to be offset.

Most original stipulations became unnecessary when ATF focus shifted to internal receiver machining (the shelf).

The M16A1/SP1 configuration is still my favorite.
 
Posts: 670 | Location: Dover-Foxcroft, ME | Registered: 25 May 2002Reply With Quote
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