Dissapator AR upper and Suppressor

[nw_aggie]

Is there any advantage to the dissipator style AR uppers and suppressor use? A fellow I was talking to was suggesting that the short barrel beyond the gas block would be an advantage when running the suppressor.

 

[OARNGESI]

The gas block on a dissapator upper and a normal 16in ar are in the exact same place. The front sight on a dissapator upper isn't the gas block so there would be no mechanical advantage.

 

[dprice3844444]

only advantage was a longer gas tube to ease recoil impulse and longer handguards.most suppressor mountings mount on flash hider adapter.suppressors are so light that barrel droop shouldn't be a problem.that issue should be taken on a case by case basis.now,if this worries you,you can get a fluted bbl that is fluted all the way out and see if you have an impact change with suppressor on/off.brownells also sells a longer gas tube to fit the shorter barrels/pistols to slow down recoil impulse.or,adjustible gas blocks.
http://www.brownells.com/rifle-part...ubes/ar-15-m16-pigtail-gas-tube-prod1591.aspx

 

[Sam1911]

If it was the old style dissipator (Colt 605) where the barrel was simply cut off in front of the front sight block, then yes a suppressor might help it be reliable as it would increase effective "dwell" time a little bit.

Most dissipator type uppers are built with a low-profile gas block at the mid-length or carbine position, though, and simply have a full front sight block at the rifle location so they can hold rifle-length handguards.

So they'll run properly with or without a suppressor.

 

[Tirod]

Exactly how I did mine. Later installed a freefloat tube and the FSB is going on a pistol build.

That is where dwell time again becomes important, as too little dwell means the system doesn't get a optimal shot of pressure to operate the bolt carrier. A suppressor might help extend the gas pressure for a longer interval, it will also elevate it and the amount of gas available. So instead of a quick high PSI burst and then sudden drop off, it's a long burst of high pressure and then more as the suppressor back blasts thru the chamber.

It gets complicated and why many use an adjustable block.

 

[nw_aggie]

The barrel I was showed during our discussion was a 16" barrel with a rifle length gas system, so was not a dissapator imitator...but thanks for the info, I may pass

 

[Sam1911]

Ehhh yeah. That's not the most reliable combination.

 

[nw_aggie]

Probably why it's for sale at the price point it is then...