Should you be able to pivot the upper into the lower via the front pivot pin with no resistance?  My cause my Model 1 upper's rear take down hinge gets resitance going down into the Vulcan lower.  Is this normal?  I'm about to sand down the lower to take the upper or should I sand down the rear take down hinge so that it slides down into the lower?

Quoted: Should you be able to pivot the upper into the lower via the front pivot pin with no resistance?  My cause my Model 1 upper's rear take down hinge gets resitance going down into the Vulcan lower.  Is this normal?  I'm about to sand down the lower to take the upper or should I sand down the rear take down hinge so that it slides down into the lower?

AS long as you can snap 'em together without slamming them around every time you are ok.  I have had some M16's that were a friggin BITCH and they never had a problem....but it makes life a lot easier when you don't have to stand on the upper to get the two to hook up.

I'd leave 'em be.

Just like with pussy, tight is a good thing......

Mike

Well I have thme both mated perfectly with the front pivot pin in.  But the next problem is the freakn rear take down pin won't go in.  Thinking of filing the rear take down pin down a little bit.  I do not want to ream the rear take down pin whole out.  Guess filing down the rear pin is better.  By the way the reason I want the upper to pivot smoothly is because I have one of those Cali legal AR's so I need to do this to reload it from the top.  Is sanding down inside the lower a good idea?

Model 1 and Vulcan.

Is sanding down inside the lower a good idea?

Not if you have the option of sanding down a $3 pin instead.

flcracker

Quoted: Model 1 and Vulcan.

Enough said as far as I'm concerned....

Make sure the buffer tube isn't protruding into the lower so the upper can't match up. It doesn't take much- a millimeter or so will give you that problem.