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Posted: 7/27/2006 6:47:36 AM EDT
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Since the 9mm is an open bolt straight blowback design, it requires the heavier weight (and consequently inertia) of the 9mm buffer to keep the bolt closed until chamber pressures drop to a safe level. Therefore, using a lighter buffer is dangerous, and likely to result in a shell busting apart in your reciever, right? So what are the drawbacks of an even heavier buffer? Are there any? Are there any good reasons to use an even heavier buffer? |
| You pretty much answered your question. The action is just plain blowback though, not open bolt as you would find in various SMGs like the Uzi or Thompson. The 9mm buffer should be sufficient for your needs. As stated in other topics, I use an M4 heavy buffer combined with a Superior Shooting Systems chrome silicon buffer spring and it works for both my 9mm RRA upper and my Bushmaster 5.56 upper. The spring is much stiffer than the stock springs. Heavier buffers than what would be used for 9mm have been used according to some posts that I've read in the past and they seem to work for them. It's always a good thing for the bolt to stay closed a milisecond longer for the pressures to decrease. |
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The AR-15 is not an open bolt weapon (execpt in some rare oddities).....a real full auto Isreali Uzi is an 'open bolt' weapon. The sub caliber AR-15 is a closed bolt blowback action. I run a tungsten weight with a short stroke Hahn Heavy Buffer..........saves wear and tear on your weapon, softens felt recoil........heavier is better. Running a standard light buffer will eventually trash your rifle, Oly or Colt style. Any naysayer is wrong! 
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