Oz Posted February 25, 2012 Report Share Posted February 25, 2012 There are AR-15 aluminum gas blocks all over the place. And in my quick search, I've seen quite a few aluminum 308 gas blocks. Does anyone know of any problems or concerns with aluminum 308 gas blocks? Quote Link to comment Share on other sites More sharing options...
392heminut Posted February 25, 2012 Report Share Posted February 25, 2012 As far as I know, AR15 and AR308s gas blocks are interchangeable, the only variation is the size. That being said, my DPMS LR308 came from the factory with an aluminum gas block. Quote Link to comment Share on other sites More sharing options...
imschur Posted February 25, 2012 Report Share Posted February 25, 2012 A good friend who was an engineer at a firearms manufacturer that worked on FAL's explained to me that based on the volume of gas associated with the .308 that the block will erode faster than with a 5.56.Probably not a big deal if your using your weapon for hunting and casual shooting but if you shoot A LOT it could be an issue. Quote Link to comment Share on other sites More sharing options...
Jgun Posted February 25, 2012 Report Share Posted February 25, 2012 I've read on one of the barrel makers site's were they don't recommend the aluminum GB's because of the fact that the aluminum GB and steel barrel expand at a different rate and you can have gas leakage. Based on all of the aluminum blocks on the market, maybe that's untrue. If you decided to run one you could always plan to replace it when you replace your gas tube. Quote Link to comment Share on other sites More sharing options...
ErikS Posted February 26, 2012 Report Share Posted February 26, 2012 Gas leaks from all over an AR. They kinda work that way. A bit from the front won't matter and the carbon will seal much of it after a hundred rounds or so. Quote Link to comment Share on other sites More sharing options...
Oz Posted February 26, 2012 Author Report Share Posted February 26, 2012 Thanks y'all. Great info here. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 27, 2012 Report Share Posted February 27, 2012 Unless you are pulling it off every time you clean your rifle , they will all seal eventually.I personally like steel clamp on type . Quote Link to comment Share on other sites More sharing options...
Jgun Posted March 1, 2012 Report Share Posted March 1, 2012 I've also read that if ultimate accuracy is your goal from the AR, the set screw mount type GB's are not ideal, because they create localized pressure at two points on one side of the bore. I'm not sure how tight you need to torque the set screws on the GB's so this may not really be an issue, but I think that the clamp on, or Noveske's pin on mounting method are probably superior. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 1, 2012 Report Share Posted March 1, 2012 I've also read that if ultimate accuracy is your goal from the AR, the set screw mount type GB's are not ideal, because they create localized pressure at two points on one side of the bore. I'm not sure how tight you need to torque the set screws on the GB's so this may not really be an issue, but I think that the clamp on, or Noveske's pin on mounting method are probably superior.It is also said that the std. taper pins on an AR , also do the same . Quote Link to comment Share on other sites More sharing options...
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