My Old Colt SP1 trigger group is the best I've ever tried. Why?

[VaderSpade]

[NapaCountyShooter]

I would figure that since you've had it for almost 30 years, it probably works great because it's well broken in. I'd guess you've put a few thousand rounds through it in that time.

[Grumpyoldretiredcop]

Those original SP1 disconnectors were identified as possible failure points by the time I first attended Colt's AR Armorer course in the 90's. When they failed, the weapon would run full auto. Even if you find another, you might not want to install it in your rifle.

That trigger is probably smooth because it's been well worked in, as NapaCountyShooter said.

[VaderSpade]

Those original SP1 disconnectors were identified as possible failure points by the time I first attended Colt's AR Armorer course in the 90's. When they failed, the weapon would run full auto. Even if you find another, you might not want to install it in your rifle.

I think you might be right about that. Although I never had a misfire with that rifle, I have been playing with the trigger in another lower (no upper) when I release the trigger very slowly the disconnector releases the hammer before it catches. I can see where this could cause a slamfire or worse if you held the trigger in half way. When I release the trigger quickly it catches with no problem. When I tried a new disconnector the problem got worse. The old trigger just may be worn out?

[Grumpyoldretiredcop]

Sear step worn on trigger, hammer or both, possibly. Time to junk that pair of parts by now, I'd say. My SP1 is on its third set of fire control parts.