Looking for original Colt Sp-1 firing pin

[Pipeandwire]

Hey guys,
i have an original Colt Sp-1 bcg that I’m looking to replace the firing fin. I would prefer a factory colt one if it’s still available but I can’t seem to find the actual part number to search for. I’ve tried Numrich’s and a bunch of others but can’t seem to find one that specifically says I it’s fits the Sp-1.
any help appreciated.
thanks

 

[papershredder]

Look on Gunbroker, they have plenty. Same as early M16 firing pins (see posts below) :

M16 firing pin lot

Colt Bolt Assembly

SP1 BCG

Colt XM16 Firing Pin

 

[Pipeandwire]

I saw that listing as well earlier, was hoping for a definitive part number. The sp-1 bolt was used in the Sporter, not sure if the sporter was called a m16

 

[Pipeandwire]

Look on Gunbroker, they have plenty. Same as early M16 firing pins:

M16 firing pin lot

Colt Bolt Assembly

SP1 BCG

Colt XM16 Firing Pin

Thanks I didnt know if the Sporter identified as m16 parts and wanted to make sure before ordering. how do i know if it’s an early or late model m16 firing pin

 

[Molon]

Same as early M16 firing pins:

No, it isn't.

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[Molon]

I saw that listing as well earlier, was hoping for a definitive part number. The sp-1 bolt was used in the Sporter, not sure if the sporter was called a m16

SP63039 Colt hasn't manufactured them in years.

...

 

[papershredder]

No, it isn't.

...

What's different between the SP1's and various M16A1,XM, 601, 604 etc.. firing pins? I get the OP may be asking for collector reasons, but disregarding any tolerance stacking issues, they should still interchange and function properly, correct?

 

[Molon]

. . . disregarding any tolerance stacking issues, they should still interchange and function properly, correct?

No. The OP is looking for the Colt firing pin that was made to work with the Colt "shaved" bolt carrier. Standard firing pins can cause malfunctions with the Colt shaved carrier. The firing pin that the OP is looking for has a smaller "flange" than the standard firing pin. The flange on the standard pin has a diameter of ~0.375" while the diameter of the "SP1" firing pin is ~0.340".

OP, your best bet to find that part is probably going to be Specialized Armament Warehouse.

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[Pipeandwire]

Actually i was able to acquire 4 sp-1 bolts. As soon as i clean off the work bench, im going to out them in the ultrasonic cleaner and put a mic on the pin and at least know the exact measurements of the one im looking for.