FCG Pocket Dimensions

Greg B · 12-18-2012, 11:08 PM

Hi everyone,
Just registered recently, first post.
I have an 80% lower and looking at the CNC guns drawings, and comparing them to the steps from Colfax in the DRO PDF, I;m coming up with some slight variations.
Before I start cutting, I want to be absolutely sure of my dimensions.
Basically, anyone know for sure if the Colfax dims are right?
Thanks, Greg B.

**Coils** · 12-19-2012, 04:49 AM

Welcome to the forum

Maybe adding links to the places your seeing these ate might help more

Did you see this? Maybe it will help if it matches one of the others
[Only registered and activated users can see links. ]

Greg B · 12-19-2012, 10:15 AM

[Only registered and activated users can see links. ]

Here is the Colfax info.
Look @ # 6 in the list.

The drawings you posted I DO have, but they are a little hard to figure out where some of the measurements are coming from.

Greg B · 12-19-2012, 11:17 AM

I'm really wanting to make sure I get the boss between the rear lug cavity & the fire control main cavity in the right location.

Greg B · 12-20-2012, 12:27 AM

This is a test pocket I made with a scrap piece of aluminum I had laying around.
The boss in I have a question about is marked.
Anyone have easy access to a lower that could verify that measurement?
Thanks, Greg B.

woodey · 12-20-2012, 10:00 AM

On some current run 100% lowers that bump is left out & is straight with the back of the pocket

Greg B · 12-20-2012, 11:49 PM

Cool.
Makes me not so worried about the machining.
Thanks, Greg B

**Coils** · 12-21-2012, 07:35 AM

Thanks for the link

I check a poly lower and it doesn't have that bump in it

**2ndAmendican** · 12-21-2012, 08:36 AM

Greg, that's a great link! Thanks!!

Greg B · 12-21-2012, 02:49 PM

You know, I wonder why, if you have a DRO, why wouldn't one just go ahead and drill the selector and other holes instead of using a jig?
That's what I'm going to do.