AR Sponsor
Posted: 2/8/2014 5:45:11 PM EDT
| I am starting a build with a 5.56 NATO chambered barrel. When I get ready to check the headspace will my .223 headspace go and no go work or do I need to buy the 5.56 go and no go. Is there any difference? |
|
A 223 REM match gage set works for both.
The difference is in the headspace spec not the type of gage. 223 REM Go 1.4636”. 556 NATO Go 1.4646”. 223 REM No-go 1.4666”. 556 NATO No-go 1.4706”. AFAIK at this time both SAAMI and the military accept the Colt spec max chamber gage 1.4736”. Note that failing a 1.4706” gage is a reject point for new 556 barrels. |
AR Sponsor