"It's Sunday night, it's raining, let's learn somethin. Tell me, what's the difference between a small or large pin trigger group in an AR15?"
Facebook fans answered:
William: Small pin is standard. Large pin is something that Colt did so that no "modifications" could be made. Fortunately they stopped that nonsense. Recently, I think.
Michael: Colt stopped using the .170" pins about 3 years ago......
Jim: To make it harder to mod for full auto, etc.
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