Headspacing.

[Fathom_Arms]

Always check headspacing. It is cheap insurance and easy to do. Anything someone touches is prone to human error. Mistakes happen.

[DutyUse]

Sorry to bring up this old thread but i'm on the fence about buying go/no go gauges for my headspace. I have the Rainier Arms NIB BCG and BCM 14.5 5.56 Barrel. All the people i've spoken to have said that they are both quality parts and they should be fine.

If I was you, and I wasn't going to build but one AR I would not buy them myself, most reputable gun stores/smiths have these and will do the process for cheaper (in most cases) then if you purchased them youself. However if you plan on doing several home builds it would a good purchase in my opinion.

[JGifford]

I have a stripped upper laying around, so I bought a Black Rain Barrel and a BCM BCG.... do I need to check headspacing or is it good to go?

I would check headspace. I personally know someone (rifle builder/company owner) who uses BCG's from a very "good and trusted" source that anyone on this forum would say "Yeah, great BCG!", who ordered about 20 of them. One would not headspace in any of the rifles. Always verify! It's cheap and can save some frustration/injury at worst.

[Iraqgunz]

Most people don't have the proper gages nor do they understand the headspace issue and why you have to make sure you aren't using a commercial .223 gage with a proper 5.56 chamber.

[JGifford]

Most people don't have the proper gages nor do they understand the headspace issue and why you have to make sure you aren't using a commercial .223 gage with a proper 5.56 chamber.

I have the correct gauges (5.56 Go/No Go). They cost me $40+ S&H. I suggest that if someone is building AR's, they buy them.

[Iraqgunz]

Actually those are not the correct gages. The military does not use a Go or No Go Gage for the M16/M4. They use a Field Headspace Gage

Scroll down on this link to Post 18 and you will a correct one.

http://www.m4carbine.net/showthread....eadspace-gauge

I have the correct gauges (5.56 Go/No Go). They cost me $40+ S&H. I suggest that if someone is building AR's, they buy them.

[JGifford]

Actually those are not the correct gages. The military does not use a Go or No Go Gage for the M16/M4. They use a Field Headspace Gage

Scroll down on this link to Post 18 and you will a correct one.

http://www.m4carbine.net/showthread....eadspace-gauge

My gauges will prevent a dangerous situation.