Geissele does a nice job of explaining the small and large diameter pins in Colt trigger groups, with great pictures.
Now on the pictures of receiver with an integral sear block, I need educated on.
Figure 3 with integral sear block
http://geissele.com/colt-rifle-users-guide/
Please point out the integral sear block for this oldMan.
EDIT: Also is it necessary to measure each pin, wouldn't just one measurement be enough:
From Geissele
Each pin needs to be pressed out of the receiver far enough to measure the pin’s diameter. Small pins will nominally measure 0.154 in. and large pins will nominally measure 0.169 in. as shown in the figure.
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