The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Modern Military Rifles Colt AR15Go | New | Find | Notify | Tools | Reply | |
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Here's my 1975 Colt SP1,great shooting rifle.    | ||
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Had one just like it back im the 70s sold it. | |||
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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 Those who can't skin, can hold a leg. Abraham Lincoln Only one war at a time. Abe Again. | |||
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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. | |||
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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. | |||
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