AR-10 vs Lr-308 dimensions?

[draco41]

I am looking for some help here, I would like someone who has a LR-308 to measure the distance from the front pivot pin to the front edge of the fire control pocket. I have a blue print for an AR-10 (no not that stupid pencil drawing going around the net...lol) . I think that the FCG placement is different but not sure, that's why i need the help. Thanks for your help

Darin

[imschur]

I can do this tomorrow or Saturday at the latest

[draco41]

Did you happen to forget about me Imschur?  ;D ;D

[imschur]

Did you happen to forget about me Imschur?  ;D ;D

Nah I got tied up with with a side job. If the phones dont ring I should be able to do it tomorrow.

[imschur]

From the center of the front pivot to the beginning of the cutout is 4"

[draco41]

hmmm, I guess it is different, the AR-10 measures 3.77". So everything I have read about the AR-10 upper fitting on a LR-308 lower has a new twist. If the pocket sits 1/4" farther back, then the hammer placement will also be off, and might affect firing pin strikes. Thanks for the info, might be worth mentioning in the FAQ.

[imschur]

maybe a better verification would be the pivot pin to the first trigger pin