Headspace Gauge & the AR – School of the American RifleChad | Posted on 02/15/2022 | Headspace Gauge & the AR – School of the American Rifle Headspace Gauge & the AR – School of the American Rifle Post Navigation ← Previous PostNext Post → One Comment Hi Chad, I have been in touch with Scott Kempel from Forster Products and he tells me that they no longer offer a three gauge set for the AR15 platform (5.56 NATO headspace “go” and “no-go” gauges). He directed me to Brownell’s. This headspace gauge that is offered at Brownell’s is not a 5.56mm NATO (1.4646”). It is a .223 headspace gauge that is 1.4736”. I would like to purchase 5.56 NATO (1.4646”) headspace “go” and “no-go” gauges from you. How do I go about doing that? Sincerely, Don Reply Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.