Forster Products5.56 NATO MIN and MAX Headspace Gage Set

If you're doing a build, you should be sure that you've got good headspace. You need to check it and this set affordable and accurate. On the small chance that the headspace is wrong, you need to know so you're not going to risk catastrophic failure and destroy your other parts and potentially harm yourself.I think there are other areas in building that you can compromise for cost, but ensure this part is correct. If not this set, get one. This set seems solid. They come in protective cases.

Min is goMax is noThe min should spinThe max should not.Test 5 barrels and only one was a little tight on min but still spunIt's works for quick checks. Best on new builds...Do not buy cheap guages...most of them are not to listed size.

I used to be one of those that believed the myth that ARs don't require checking headspace. A catastrophic failure with a build using a .223 wylde barrel from a highly regarded manufacturer my mind. Decided to try these gauges just to see if it was a headspacing issue. The ammo was definitely on the hot side (IMI 55gr) but I later found that the bolt would just barely close on the MIN guage when applying force in a squeaky clean chamber. Tight chamber and and spicy 5.56 is a bad combo. These gauges are perfect for ensuring the safety of a build and should be in the toolkit for any hobbyist who plans on doing a bunch of home brews.

These are well made and they are accurate. They cost a little more but they can be trusted to give a good answer to your go/no go question.

Does the job I need them to do. I check all my builds with these gauges.

Every AR owner should have a set of these.

The Go gage is clearly marked as Forster .223 Go and 5.56 , 1.4636 Min and the No Go is marked as Forster 5.56, 1.4736 Max. They have a nice, clean quality surface and worked well. Packing was great in two separate protective plastic sleeves.

work perfect on my barrel. Thanks.