See the following thread regarding 'NEED'.

http://www.ar15.com/forums/t_6_51/434141_Any_kind_of_tuning_needed_for_reliable_SBR_.html

As I posted there:

As shown in my videos, I am also getting ZERO malfunctions, suppressed and unsuppressed.





Nobody said you NEED optimal performance.   You don't NEED
to drive 100 miles on the highway in 5th gear....you could drive that
distance in 1st gear the whole time.  1st gear can cover that distance
just like 5th gear can so why bother with 5th gear?  I think the answer
to that is obvious.  We've done many demo's and the difference to
everyone is obvious when running a suppressor w/ regulated gas.  
We strive hard to make products that really work and proving that they really do work.





How do we 'prove' that they work?  For the Govnah:





1.  Full Auto RoF - adding a suppressor typically adds around 200 RPM
faster cycling rate.  Suppressors add backpressure which increase the
RoF so bringing the port size down brings the system back in balance and
RoF will be closer to unsuppressed RoF.  Many don't care about full
auto and that is not the point.  The point is that the results can be
quantified and shown with a video for people that are not physically
present to do a live fire demo.





2.  Gas expelled from the ejection port - while hard to quantify, it is
clearly increased and can be seen in videos as seen above and below.





3.  Recoil - at this time, this is best experienced in person.  However,
we are working with some folks now to give actual numbers on this for
more quantifiable data.





4.  Increased fouling - increased fouling definitely occurs and we have
many customers that are extremely pleased at how much cleaner their
suppressed AR now runs which allows them to run longer (increasing
reliability).





5.  Parts stress - a possibility and makes sense but would be hard to
quantify.    As mentioned above, if your extractor spring is a little on
the weak side, you will probably have extraction failures when adding
the suppressor IF you are not regulating the gas.  I have proven that
many times.    So logically, your extractor spring has to work harder if
not regulating the gas.  Many don't care about that and just use an
O-ring or extra power extractor spring.  I do the latter myself and that
is not the point.  The point is that I know the spring isn't working as
hard and will most likely never need to be replaced since I am running
optimal gas in all modes.
All that said, we know this product is not for everyone.  If none of the
5 points mentioned above are important to you then by all means don't
bother with it.  
The biggest issue for most people is that it is not 'automatic'.  Their
is a  crowd out there that doesn't want to remember to move the
regulator plate to the unsuppressed position when they remove the
suppressor.





We have considered designs to 'automatically' adjust the port sizing
when a suppressor is mounted but I personally don't like that idea as I
would prefer to have control over the gas under all conditions.  Running
a 3 position block suppressed, I can go up two port sizes in cases of
excessive fouling or adverse conditions.  I personally never had to do
that but  some of our customers may run into those kinds of situations.
Likewise, you now have a normal and high for unsuppressed usage as
well.  



>>>>>>>>>

Here is another thread with some guys running the Govnah on MK18's:http://www.ar15.com/forums/t_2_543/254317_Govnah_Install_on_DD_MK18_AAR_.html





 

Correct...it all comes down to what you have to work with and what you are comfortable doing.

In the case of a commercial DD MK18 barrel ported at .082, then that is a perfect candidate for a optimal-unsuppressed/suppressed/adverse setup (.070/.049/.082) since the port in the barrel is already huge and you don't have to alter anything on the original barrel.

We've had some customers put them on military MK18 barrels ported to .070 and go with a two position while some want the adverse and are comfortable increasing the port size for an adverse.



The A5 shines in overgassed configurations.  We have many military/LE customers and many of them don't know what an A5 is.  I have found that I had to go up in port size to be reliable in full auto.  I personally don't see much gain in the A5 system when you have control of the gas.  Controlling the gas is much more drastic than messing with buffers and buffers don't do squat in reducing fouling coming into the action.



 

On the site when ready....probably about 3 weeks out right now.  Shoot me an email if you would like me to put you on the notification list.

Thanks!