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Posted: 2/9/2008 5:37:31 AM EDT
| after building first lower a rockriver with two stage lpk ,i am thinking of trying a upper. it sounds like headspaceing is not really much of a problem,but i feel it is worth the price of a set of gauges to check it out anyhow . but is there a difference in gauges? meaning with a5.56 chamber will 223 gauges work or vise verse?what about 223 wylde?will be useing a rr upper just becouse i want matching upper and lower.been looking at the saber defence barrels that pk arms carries looking at the 18 "cm cl flutted model.any opions of these barrels?any one know what dia. gas block this barrel uses? what are the odds of any headspace problems with this setup? |
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I built my last one from the ground up with Del-Ton parts... it wasn't horribly complicated at all. Need a vise and an action block, barrel nut, torque wrench, etc... As far as gauges, all you really need is a field gauge. From what I've read, head-spacing is rarely ever an issue with a modern manufactured barrel. |
I use .223 b/c that was what was available when I started buying tools years ago. I also have an understanding of what a 5.56 barrel should headspace. Stolen from the tacky:
My .223 Forster gauges are: No-Go- 1.4666 Go- 1.4636 Field- 1.4696 I usually deal with used 5.56 chambers, so as long as the .223 go closes, I move on. I usually go straight to the field guage. You will note that the .223 field gauge is 1.4696. The 5.56 Forster No-Go measures 1.467. As long as the bolt doesn't close on the.223 field gauge, you should be fine. I have yet to have a 5.56 close on my .223 field gauge. If I didn't already have the .223, I would buy a full set of 5.56. Check at Sarco. I think they sell the 5.56 Field gauge that should get you through 99% of headspacing. |
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Excessive headspace is not a problem anyway, unless it is obscene. SHORT headspace is what will get you into trouble. Look at the headspace of the modern SAW. It uses M855 ammo and is way longer than any M16 chamber. Even if your chamber closes on a FIELD gauge it is likely safe to fire... the problem is - you just dont know how long it is.... so that is considered a reject. Short headspace will cause fail to chamber, and pressure problems. However, if you can take any ordinary ammo, and lightly chamber it, and the bolt lock without having to hammer your forward assist... you are good to go. Which is why I still maintain all this headspace checking is unnecessary. Take any AR15. Lightly chamber a round. If it will close and lock - good to go. Then, fire the first round. Examine the brass. No major issues seen? Good to go. |
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