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What is the little block that says "COLT"?

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Fri May 26, 2017 4:56 pm
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Colt sear block, see https://geissele.com/colt-rifle-users-guide/

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About 1989-1990, Colt began installing sear blocks in their lower receivers to prevent the later installation of auto-sear components. The photographs below show a standard receiver without a sear block (Fig. 1), a receiver with a pinned-in sear block (Fig. 2), and receiver with an integral sear block (Fig. 3).

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Fri May 26, 2017 5:05 pm
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Amazing! Thank you. Though I can't for the life of me understand why they would want to keep you from going full auto... ¯\_(ツ)_/¯


Fri May 26, 2017 5:32 pm
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Damn . . . I learn something new every day if I'm not careful.

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Fri May 26, 2017 7:36 pm
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Specialized Armament will machine that block down flush with the lower rcvr (for a small fee) so you can use a full auto BCG (note: the entire process is legal,m and using a full auto BCG does not turn your AR into a machine gun. Using the FA BCG will give you more mass if your require it to cycle propelry for your setup.)

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Sat May 27, 2017 12:31 pm
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jukk0u wrote:
Specialized Armament will machine that block down flush with the lower rcvr (for a small fee) so you can use a full auto BCG (note: the entire process is legal,m and using a full auto BCG does not turn your AR into a machine gun. Using the FA BCG will give you more mass if your require it to cycle propelry for your setup.)


Can't you just remove the block and use any BCG you want?


Sat May 27, 2017 2:24 pm
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I'd prefer to not do business with a company who voluntarily invented sear blocks and such when they were never a legal requirement.

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Sat May 27, 2017 2:31 pm
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Is that the Hillary block? I've heard the Hillary hole has fallen out of favor, and hasn't been sighted in over 37 years. :wink05:

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Sat May 27, 2017 3:02 pm
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Huma knows where it is.

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Sat May 27, 2017 3:05 pm
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Huma knows where it is.

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Sat May 27, 2017 3:13 pm
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This may sound crazy but I just went out and looked at my older Colt's to see if I had one of these.....................NOPE I'm good.


Sat May 27, 2017 3:56 pm
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Massivedesign wrote:
jukk0u wrote:
Specialized Armament will machine that block down flush with the lower rcvr (for a small fee) so you can use a full auto BCG (note: the entire process is legal,m and using a full auto BCG does not turn your AR into a machine gun. Using the FA BCG will give you more mass if your require it to cycle propelry for your setup.)


Can't you just remove the block and use any BCG you want?


Unfortunately along with the block there is a large steel pin that retains it. The pin is in the location that an auto sear pin would occupy in a full auto lower. It is also larger diameter than the sear pin to make it extremely difficult to install an auto sear. Colt tried their damndest to get ahead of the "assault weapon" mania of the late '80's/early'90's, they didn't go full Bill Ruger but close.

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I'd prefer to not do business with a company who voluntarily invented sear blocks and such when they were never a legal requirement.


No Ruger, (Bill was father of the 10 round magazine idea) or S&W (sweetheart trigger lock deal with the Clinton administration) for you either I assume?


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Sat May 27, 2017 4:55 pm
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Massivedesign wrote:
jukk0u wrote:
Specialized Armament will machine that block down flush with the lower rcvr (for a small fee) so you can use a full auto BCG (note: the entire process is legal,m and using a full auto BCG does not turn your AR into a machine gun. Using the FA BCG will give you more mass if your require it to cycle propelry for your setup.)


Can't you just remove the block and use any BCG you want?


The block is hardened steel, and I think you pretty much destroy the lower digging it out. (it might be cast into the aluminum?)

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“Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith

"The said Constitution shall never be construed to authorize Congress to prevent the people of the United States who are peaceable citizens from keeping their own arms." ~ Samuel Adams

“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli

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Sat May 27, 2017 5:15 pm
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Ahhh. I read that it was pinned in, didn't know it was basically permanently pinned and is there to hide/block the infamous third hole.

That makes sense why they did it, to allow them to. Or have to destroy their unsold lowers when the GCA came crashing down.


Sat May 27, 2017 6:33 pm
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They can be removed with some effort. You have to make a couple careful cuts to get through the pin in the side of the receiver so you can pull it off the pin that's on the bottom. Once you do though, you'll have large holes in your receiver. You could probably epoxy in some blanks to fill them, or maybe thread them and use flat set screws to fill them.


Sat May 27, 2017 11:05 pm
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