Older Colt Question > AR Discussions

Posted: 3/5/2007 4:46:14 PM EDT

Came across a large pin Colt AR with a sear block. What was the purpose of these? What was the point of drilling the hole and then installing a block for the sear? I realize it would be illegal, but are they removable?

I'm not a Colt collector but this was a really nice original Colt upper and lower. Looked like a pencil barrel. He said he would sell it for $1500. I wasn't interested.

Posted: 3/5/2007 6:24:50 PM EDT

[#1]

Quoted:
Came across a large pin Colt AR with a sear block. What was the purpose of these? What was the point of drilling the hole and then installing a block for the sear? I realize it would be illegal, but are they removable?

I'm not a Colt collector but this was a really nice original Colt upper and lower. Looked like a pencil barrel. He said he would sell it for $1500. I wasn't interested.

the purpose of the sear block was to prevent the installation of a drop in auto sear, or a lightning link

and removing them is not illegal

Posted: 3/5/2007 6:42:05 PM EDT

[#2]

Quoted:

Quoted:
Came across a large pin Colt AR with a sear block. What was the purpose of these? What was the point of drilling the hole and then installing a block for the sear? I realize it would be illegal, but are they removable?

I'm not a Colt collector but this was a really nice original Colt upper and lower. Looked like a pencil barrel. He said he would sell it for $1500. I wasn't interested.

the purpose of the sear block was to prevent the installation of a drop in auto sear, or a lightning link

and removing them is not illegal

Wouldn't removing it make it ready for an auto sear?

Posted: 3/5/2007 6:46:21 PM EDT

[#3]

The block that i've seen has a very large hole on the right, way to big for a pin. The removal method just cut the center block out (you could now use a FA carrier)& left the metal in the receiver to avoid having a hole.

Posted: 3/5/2007 6:52:08 PM EDT

[#4]

The pin hole for the drop-in block is NOT the same for the sear. The block was simply added to "block" that portion of the receiver the DIA (drop in auto-sear) fitted into, and the hole for the pin is not related to the pin for a military M16 automatic sear (the DIA did not require a pin).

Posted: 3/5/2007 6:55:22 PM EDT

[#5]

Thanks for the info.

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