piston or DI for 5.56 12.5" sbr?

raider1v1

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Minuteman
Mar 16, 2010
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Kansas City, MO
while I am waiting on my form 1 to come back, I was looking for some info on the upper i should get for my sbr. I will be running it suppressed with a liberty torch. Do you guys have any recommendations on the DI vs gas piston for a suppressed sbr?
 
Re: piston or DI for 5.56 12.5" sbr?

are there any manufacturers that make a gas 12.5" upper besides LMT? I have a call in with them to clarify if its a 12" or a 12.5". Some places online have it listed at 12.5", while their webpage says 12".
 
Re: piston or DI for 5.56 12.5" sbr?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Raider1v1</div><div class="ubbcode-body">are there any manufacturers that make a gas 12.5" upper besides LMT? I have a call in with them to clarify if its a 12" or a 12.5". Some places online have it listed at 12.5", while their webpage says 12".

</div></div>

BCM

http://www.bravocompanyusa.com/AR-15-12-Upper-Receiver-Group-s/129.htm
 
Re: piston or DI for 5.56 12.5" sbr?

Check out Adams Arms, Barrett, or Loki weapon systems. Been checking out the same thing for my SBR build. So far Barrett REC7 wins but not by price but cause they have addressed the carrier tilt issue while running suppressed. Next is Adams Arms just because they are have the cost of the REC7. For DI LWS just because they too have addressed the carrier tilt. Last is Daniel Defense have seen or read anything bad about the MK18 upper. If Socom is using them I would think they are running suppressed but dont know for sure. Just dont want to replace a upper every couple thousand or less rounds cause the BCG is eating it up.
 
Re: piston or DI for 5.56 12.5" sbr?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KillShot</div><div class="ubbcode-body">Piston will run cleaner than DI when suppressed. </div></div>

This is a myth. All the gasses and crap go back down the barrel. This is why the cases turn black. Either one will get just as dirty. Look at the Noveske 12.5 Switchblocks. They will allow you to adjust the gass so you can control the cycle rate that will be increased with the suppressor.
 
Re: piston or DI for 5.56 12.5" sbr?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jakhamr81</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KillShot</div><div class="ubbcode-body">Piston will run cleaner than DI when suppressed. </div></div>

<span style="font-weight: bold">This is a myth. All the gasses and crap go back down the barrel.</span> This is why the cases turn black. Either one will get just as dirty. Look at the Noveske 12.5 Switchblocks. They will allow you to adjust the gass so you can control the cycle rate that will be increased with the suppressor.</div></div>

That doesn't apply to all piston systems so maybe I should've clarified and said a POF will run cleaner because the POF vents the gas OUTSIDE of the rifle. NOTHING goes back down the barrel.
 
Re: piston or DI for 5.56 12.5" sbr?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Blackops_2</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Raider1v1</div><div class="ubbcode-body">are there any manufacturers that make a gas 12.5" upper besides LMT? I have a call in with them to clarify if its a 12" or a 12.5". Some places online have it listed at 12.5", while their webpage says 12".

</div></div>

BCM

http://www.bravocompanyusa.com/AR-15-12-Upper-Receiver-Group-s/129.htm </div></div>

sorry, i mean to say gas piston. i really like this one of the BCM uppers, but i thought hey, why not make it more complicated.

http://www.bravocompanyusa.com/BCM-SS410...10%20vtrx11.htm
 
Re: piston or DI for 5.56 12.5" sbr?

In my opinion, piston is a solution to a problem that doesn't exist.

DI guns are lighter, handier, and balance better.

I drank the piston kool-aid and bought a Ruger SR556. It's a good gun and runs nice, but I wouldn't buy a piston gun again.

Get a piston if you must see for yourself...
 
Re: piston or DI for 5.56 12.5" sbr?



The nature of what the suppressor does. It slows the escape of gasses. One result of this is that they go back down the barrel and into the chamber unless you shut the gas off. Doesn't matter how you vent it.
 
Re: piston or DI for 5.56 12.5" sbr?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: turbo54</div><div class="ubbcode-body">In my opinion, piston is a solution to a problem that doesn't exist.

DI guns are lighter, handier, and balance better.

I drank the piston kool-aid and bought a Ruger SR556. It's a good gun and runs nice, but I wouldn't buy a piston gun again.

Get a piston if you must see for yourself... </div></div>

annnnnnd no longer thinking of a piston with that review combined with the carrier tilt business. most of what i read online were mixed reviews anyway. this is exactly what i needed to know.

about the extra gas, i have these already on all my rifles that i will be running suppressed. they work very well on unsuppressed rifles and take away all of the venting through the charging handle.

http://www.weaponoutfitters.com/products/ar-gas-vent
 
Re: piston or DI for 5.56 12.5" sbr?

My Scar does run a lil cleaner than my DI, however not enough to justify the extra cost a a gas piston upper vs DI. My ACR was just as dirty as a DI running suppressed. Doesnt matter what your running its still going to get dirty and you will have to clean it. My only concern which was stated above in another post is carrier tilt.
 
Re: piston or DI for 5.56 12.5" sbr?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jakhamr81</div><div class="ubbcode-body">

The nature of what the suppressor does. It slows the escape of gasses. One result of this is that they go back down the barrel and into the chamber unless you shut the gas off. Doesn't matter how you vent it.</div></div>

As stated previously, not all piston systems are created equally. Get behind a POF sometime, with or without a suppressor, and you'll have a different opinion.

 
Re: piston or DI for 5.56 12.5" sbr?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KillShot</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jakhamr81</div><div class="ubbcode-body">

The nature of what the suppressor does. It slows the escape of gasses. One result of this is that they go back down the barrel and into the chamber unless you shut the gas off. Doesn't matter how you vent it.</div></div>

As stated previously, not all piston systems are created equally. Get behind a POF sometime, with or without a suppressor, and you'll have a different opinion.

</div></div>

I shoot a lot of suppressed guns. I have shot behind a suppressed POF gun. It gets dirty like any other piston or DI gun that I have ever seen. There is no way around the physics of the gas coming back through the barrel when the gun is suppressed.
 
Re: piston or DI for 5.56 12.5" sbr?

I have a 12.5" Noveske with Switchblock - it definitely helps with back pressure and reducing the cyclic rate with it turned to 'S'.

I also have an MRP configured with a 12" piston setup. It seems very reliable but I haven't fired it enough to compare it to my 10.5" DI MRP as far as getting fouled in the receiver.

Maybe I'll do a face to fact test on them some day with the 16" barrels on both.