We've built up a nice selection of Go/Nogo gauges for AR-15 builds.
For those unaware these are basically dummy rounds made from tool steel and precisely sized to fit in the chamber and confirm you have the right headspace. This is important to check when assembling an AR (or SLR, WK-180c, or BCL102) Upper, because if the headspace is too tight the rounds won't chamber (or they chamber wayy too tight), if too loose then your case can rupture or worse.
How to use -- first make sure your chamber and bolt are clean, then drop the GO gauge in the chamber, try to close the bolt, is should close easily. Eject and then try the same with the NOGO gauge, the bolt should not close. If it closes on both gauges, you have too much headspace, if it won't close on either gauge, then you don't have enough headspace and it's back to the bench or smith for adjustments.
Our gauges are made by a precision tool shop for us to SAAMI specs and laser-etched with the chamber size and "go" or "no-go" so there's no mistaking what's what.
We realize some folks are reluctant to buy an expensive tool to use it only once or twice so we offer a rental program. Simply buy the gauges normally, use them and ship them back and we will refund you the purchase price less a $20 rental fee per pair.
At the time of writing we've got the following GO NOGO gauges in stock:
For those unaware these are basically dummy rounds made from tool steel and precisely sized to fit in the chamber and confirm you have the right headspace. This is important to check when assembling an AR (or SLR, WK-180c, or BCL102) Upper, because if the headspace is too tight the rounds won't chamber (or they chamber wayy too tight), if too loose then your case can rupture or worse.
How to use -- first make sure your chamber and bolt are clean, then drop the GO gauge in the chamber, try to close the bolt, is should close easily. Eject and then try the same with the NOGO gauge, the bolt should not close. If it closes on both gauges, you have too much headspace, if it won't close on either gauge, then you don't have enough headspace and it's back to the bench or smith for adjustments.
Our gauges are made by a precision tool shop for us to SAAMI specs and laser-etched with the chamber size and "go" or "no-go" so there's no mistaking what's what.
We realize some folks are reluctant to buy an expensive tool to use it only once or twice so we offer a rental program. Simply buy the gauges normally, use them and ship them back and we will refund you the purchase price less a $20 rental fee per pair.
At the time of writing we've got the following GO NOGO gauges in stock:
- 556 Nato
- 223 Rem
- 300 BLK (AAC)
- 204 Ruger
- 224 Valkrie
- 6.8 SPC II
- 223 Wylde
- 6.5 Grendel
- 7.62x39
- 6x45
- 277 Wolverine
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