AR15 LOWER RECEIVER DIFFERANCES

[markm]

There is no "sear block" in either of those lowers. The Colt has less milling in the interior. But the sear block is a pinned part that sticks up out of the lower.

[AKDoug]

Doesn't the sear block go right where that extra material is in that lower?

[polymorpheous]

There is no "sear block" in either of those lowers. The Colt has less milling in the interior. But the sear block is a pinned part that sticks up out of the lower.

Correct.
He would need to run a half moon carrier if he had the super PC block.

For lack of a better term, I called it a sear block.
The unfinished milling makes it impossible to install an auto sear.

[Patriot328]

FWIW this is a sear block:

[polymorpheous]

FWIW this is a sear block:

There is so much wrong with that picture!

[Gun]

There is so much wrong with that picture!

The orangy thingy behind the take down pin?!!?

[polymorpheous]

The orangy thingy behind the take down pin?!!?

That.
The sear block.
The pistol grip.

[patrick sweeney]

The sear block, yes. As for the pistol grip, cut the guy some slack. Maybe the owner has gorilla-like hands, and needs the extra reach.

[Patriot328]

I just swiped it from the net. Not my pic.

[motorolahamm]

Thanks GUYS