What makes mags gas hogs?

[athomas]

I think the biggest part of the efficiency equation for the mag is the barrel. You can't change the size of the air chamber or how long it stays open (other than changing level 10 springs). By finding the proper length, you can increase the efficiency immensely. The longer the back of the barrel before the porting, the smaller the porting, the best paint fit, etc., all have a big impact on increasing the efficiency. A short back with big porting makes a quiet gun but will be very inefficient. I know when I use an All-American barrel, my efficiency goes way down. When I use a 12" Equation, my efficiency goes way up. The Equation has a long back and tiny porting. My Equation is much more quiet as well.

Edit: fixed spelling errors

[Andrew - NYC]

Just dialed in my lvl 10 (sweet!), and had around 4000 psi left in my 68/4500 tank, so... I thought I'd test my RT Custom effiency during dry firing

Everything was nice and oiled up!

My set up is:
RT Custom Pro
Wingless Tac rail
ULT
PMI 68/4500 fixed reg. N2 air

I was easily able to get 750+ clean, bolt resetting, shots with no problems - fast (walking the ULT is pretty easy) I needed to push the bolt back (a few times), and had an increase in short stroking from 750 - 900, and didn't have enough gas after that.

Basically, once the tank went below 1000 - 950psi my MAG ain't happy

I'd conservitively expect to get around 900 - 1000 shots per fill on my tank. Since my max scenario load is 950 this is a perfect amount for me. I normally run with 800 rounds (or less), so one 68/4500 tank is more than enough.

MAG's rule !!!!!!!