My Apologies!

[Steve4102]

  My apologies to this board and to Rock Island Arms.

In a previous thread I posted that my RI 10mm bore measured .4035 groove diameter.  I got this from the bore slug that my Gunsmith  gave me.


A few days ago I found a little  more info on his bore measuring technique using Cerrosafe.  What I found is that this material not only shrinks, but it also expands.  To get an accurate measurement the cast must be measured at exactly 1 hour after the pour.  After that it will continue to expand.  This is something I did not know and something this so called Smith did not know.

So, My bore is NOT .4035 as I previously reported and I apologize for the confusion.  I am going to push a lead ball through the bore myself and measure it sometime in the next couple days.  My guess is it will be .400 as it shoot be.

[sqlbullet]

Let us know what you find.  News like that will put this gun back on the must have someday list for me.

[Steve4102]

  I slugged the bore with three different pure lead balls.  They all measured .4015-.402.  Still over sized as far as I am concerned.  Still gets a trip back for a new barrel.  That's if they ever get any parts in the country.

[sqlbullet]

That is oversized, but my Glock was a solid .401" plus a hair.  If they will replace it with a bore closer to .400 that is good, but .4015" is probably livable for cast bullets sized .402-.403"