need a 5.56 field gauge

**edritchey** · June 4th, 2013, 08:48 PM

http://www.ebay.com/itm/HEADSPACE-GA...item58a0a2c956

**Gun** · June 5th, 2013, 11:30 AM

Originally Posted by caferacer

it is a new barrel and an old bolt, never assume it is fine, always check to be sure, better safe than sorry, I should just spend the $22.99 for a field gauge from Brownells http://www.brownells.com/gunsmith-to...-prod6646.aspx
but they are out of stock at the moment,

Since this is a budget 'assembly', then accuracy is not key, and if the barrel is a 5.56, then you can you the 223 field gauge for max. dimension.

**Pa.Sniper** · June 6th, 2013, 11:04 AM

Originally Posted by caferacer

my go gauge is a properly sized case, that and a field gauge is all you need for close enough, (this is a low budget build) that 3 gauge set is nice, though $79 is more than I am looking to spend at the moment,

Again. May I ask, how are you going to head space this rifle, or any ar15 for that matter? If it's a new install, budget or high dollar, makes no difference.

**USMC3531** · June 6th, 2013, 12:16 PM

All he is doing is checking the headspace, headspace on ar15 barrels are done (mostly) at the factory when they install the barrel extension onto the barrel (threaded on then pined in place)

**Gun** · June 6th, 2013, 03:17 PM

Originally Posted by Pa.Sniper

Again. May I ask, how are you going to head space this rifle, or any ar15 for that matter? If it's a new install, budget or high dollar, makes no difference.

Checking headspace is not the same as headspacing. Using an old bolt with a new barrel assembly, one should check the headspace to see if the old bolt is still applicable, otherwise the old bolt gets tossed and another (new) bolt is tried.

For improved accuracy using an AR barrel, a bolt is used that is held within tighter tolerances for headspace. Noveske does this.

**caferacer** · June 6th, 2013, 08:57 PM

Originally Posted by Pa.Sniper

Again. May I ask, how are you going to head space this rifle, or any ar15 for that matter? If it's a new install, budget or high dollar, makes no difference.

and how may I ask, do you know if you NEED to head space your rifle, if you never check?
only a fool assumes they dont have a problem, until something breaks

**Pa.Sniper** · June 6th, 2013, 09:09 PM

I check all new builds with go and no-go gauges. If I do a new build, new barrel, upper and bcg, I don't even check them anymore. Every other rifle I check, just not ar's.

If I am buying a used one or taking one as a trade, I will use a no-go. If it doesn't pass that I will avoid the deal.