I am picking up another DD upper, I have DD lower and DD BCG to go along, should I be concerned about headspacing, send it to factory to check? I am not planing on getting the gauges.
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I am picking up another DD upper, I have DD lower and DD BCG to go along, should I be concerned about headspacing, send it to factory to check? I am not planing on getting the gauges.
You will be g2g for sure if you are using all DD factory parts. In fact you could even use a colt or BCM or many other manf. BCG's in your upper and the headspacing would be acceptable, does that mean it would be proper in every instance and you shouldn't gauge it? No but as it is you have a bolt and barrel by the same proprieter and they will mate nicely.
A simple search would have revealed plenty of previous discussions about headspace.
Although I always check the headspace it is generally assumed that if you are using quality known manufactured components (which you are) then you are probably safe.
But, if you buy a simple "Field" gage then you have extra insurance.
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I wasn't planning on getting a gauge, but I think I will. Can you recommend one? All I found were go no-go ones which require to disassemble the bolt, do all gauges require to disassemble the bolt?
Last edited by GTifosi; 08-27-11 at 17:43. Reason: added linx
from the pictures on the Forster web site, their guages are not cut outr so you have to strip the bolt. Who makes a mil-spec guage that doesn't require stripping the bolt. I know there is one, just can't remember.
You're saying these pix directly from the Forster site don't look like the gauges are cut out and the bolt must be stripped to use them?
Go, 5.56mm NATO
No-go, 5.56mm NATO
You absolutely sure about that?
I mean mine look just like that and work perfectly without having to strip the bolt.
They even extract and eject upon retracting the BCG.
Last edited by GTifosi; 08-28-11 at 00:27.
I can't tell for sure. But, if you compare it to a military gage they are different. The military gage has a more rebated or recessed rim. In fact it only touches the bolt face and not the extractor or ejector.
Bushamster does does a "field" headspace gage, but it still has the non-MIL type of rim.
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I know of the ones you speak.
They are turned down, well ground actually, on the end so that there's a round protrusion that is of smaller diameter than what the extractor and ejector pin represent on the bolt face. It just barely covers what area the 'primer circle' ends up on on the face.
Put them in, run the bolt forward, dump them out manually or suck them out with a stick magnet.
The Forsters are grooved with an extractor ridge and have a recess hole drilled in them to clear any potential firing pin protrusion, *which isn't present for whatever reason on the above described IIRC.
The only instance of bolt stripping that Forster mentions in any of thier instructions is in regard to bolt actions.
It is suggested that the extractor be removed from them to help get a better feel and free-er bolt rotation as the lever arm that the bolt handle represents can do a pretty good job of messing something up if worked too hard due to a numb feel.
There is no mention anywhere for either bolt action or semi auto action about removing the ejector assembly.
Their gauges are meant to be used with a fully assembled bolt when working with semi autos.
If there is concern about the ejector throwing off the gauging, then I'd suggest that the issue is the ejector itself that likely has an issue such as something foreign in its bore or an over long spring or ejector proper preventing free or full movment.
Basically if the ejector does throw things off, its because it's not being allowed to be compressed down into its hole and flush with the bolt face as it should normally be able to do. Likely it screws up brass and has locking/chambering issues as a result also.
*it's been more than a couple years since I fondled that type so could be mistaken. But given the smaller diameter of the bolt contact point, it wouldn't make sense to make the gauge more delicate by doing such, especially in a .mil environment.
EDIT:
Iraqgunz, this would be the one you're talking about, correct?
Wasn't there a Bill somebody a while back that would regrind the Forster type gauges into the mil type gauge for a fee?
Last edited by GTifosi; 08-28-11 at 09:33. Reason: last section w/pic
Last edited by *Paladin*; 08-28-11 at 11:01.
-Steve
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