https://www.forsterproducts.com/product/nato-chamber-headspace-gages/I believe only Forester makes it. The funny thing is Forester and most other gauge manufacturers mark the gauges improperly.
The .14636 GO by Forster and other Manufacturers are often labeled 5.56 GO or NATO GO.
The 1.4646 Forster gauge is marked .223 GO.
It's backwards!
The proper 5.56 or Wylde GO Is called the 1.4646 SPECIAL PURPOSE Gauge.
This is it through brownells:
Part # 100-010-713MB
5.56mm Colt Spec Go Gauge
I found one in stock... Is this right?
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