Manson Precision 5.56mm NATO Go and No Go Headspace Gauge Set

I completed my first build, this one using an Aero Precision barrel and bolt. They should have been in proper spec, but I bought these to double check anyway. Go gauge, bolt closed. No go, bolt didn't close. Easy. Test fired it and the gun ran like a champ. It's a small price to pay for being certain the gun won't blow up in your face. The gauges were well marked and easy to read as well. Good to know that I have these for any future builds.

They tell if I should pew pew or should not pew pew.

Checked my head space in about five minutes and did not have to remove the extractor from the bolt since these gauges have a cutout for the extractor. Most other head space gauges require you to remove your extractor and though this is not a complicated task, it is nice not to have to worry about shooting the extractor spring across the room. Great idea to have a cutout for the extractor.

Product did its job as advertised, quick delivery, would reccomend

Very nice product

Works well.

Measure the unknown and feel good about it.