Seal- Forward?

[Newt]

Hey all,

I'm pretty new to the mag and still trying to get my head all the way around the design. I've been nothing but impressed so far.

How does the AGD bolt style ensure gas goes into the barrel, though? Every other bolt system I've seen from the Tippmann style to the SP design to the new Bob Long valve to Autocockers have a method of sealing the bolt with the barrel at the time the valve is opened. Bolt-barrel seal = efficiency.

How's that work on the mag? There's no oring on the bolt's outside diameter, and if there was it'd get chewed to shreads by the spring.

[vf-xx]

to the best of my knowlege it doesn't seal.

Then again. Mags are not known for air efficency either. Love em anyway. :)

[cockerpunk]

well if you look at a level 1o bolt you'll notice a wee bit back from the bolt face, here is a little hump. this is a swell in the bolt that insures the bolt and barrel seal up reasonably well. its about a 3-4 thou sealing ridge.

[vf-xx]

well if you look at a level 1o bolt you'll notice a wee bit back from the bolt face, here is a little hump. this is a swell in the bolt that insures the bolt and barrel seal up reasonably well. its about a 3-4 thou sealing ridge.

I thought that was part of the tapering due to the anti chop functions. I need to go look at it again.

[Newt]

well if you look at a level 1o bolt you'll notice a wee bit back from the bolt face, here is a little hump. this is a swell in the bolt that insures the bolt and barrel seal up reasonably well. its about a 3-4 thou sealing ridge.

Okay, I see the hump now. It doesn't work very well, I can blow through my barrel with the bolt "sealed" in it, and feel air flowing around it (moreso even than the porting).

Perhaps I'll put an old barrel on the lathe and machine an oring gland into it.

[cockerpunk]

well that was one big problem with twist locks. most companies tended to bore out the whole thing to whatever bore size they barrel was, and the breach just became whatever size that was. the fit between barrel and bore caused either lots of blowback, or even bolt stick. with the move in the ULE bodies to cocker, then at least the breach size was consistent.

[Newt]

Okay, so that's the deal. It does seal reasonably well in the ULE body. There's still a fair amount of leakage past the bolt and up the feedneck, just with moderate lung pressure.

Huh. Maybe AGD will fix this with the lvl 11 bolt and we'll all get to brag about how efficient our 'mags are.

[kcombs9]

I got a feeling the the mag's lack of air efficiency is not due to the way the lvl 10 seals with the barrel...

when was the last time you ran out of air in one game? what field wont offer all day air?

yeah I have to fill my tank more then the kiddies using the Ion's. But I still own them

[vf-xx]

when was the last time you ran out of air in one game? what field wont offer all day air?

Last time I played, when I forgot to air up after every 2nd game, while renting a 68 ci 3k tank.

[kcombs9]

Last time I played, when I forgot to air up after every 2nd game, while renting a 68 ci 3k tank.

Bummer. I use a 88ci 4.5k, so moral of the story check your tank!

[cockerpunk]

I got a feeling the the mag's lack of air efficiency is not due to the way the lvl 10 seals with the barrel...

i'd be willing to bet that you could pick up 10 fps cause of it.

[kcombs9]

i'd be willing to bet that you could pick up 10 fps cause of it.

I'm sure you could. I was just saying that there is more then just that. and the lvl 10 alone is a good drop in efficiency over the lvl 7. but the trade off for NEVER chopping paint. ill fill my tank an extra time for that.

[vf-xx]

Bummer. I use a 88ci 4.5k, so moral of the story check your tank!

Let's not get started. I have a 114 4.5k that I normally use, but the reg got jacked up when I rehydroed it last.

[cockerpunk]

I'm sure you could. I was just saying that there is more then just that. and the lvl 10 alone is a good drop in efficiency over the lvl 7. but the trade off for NEVER chopping paint. ill fill my tank an extra time for that.

i dont think your gonna get 20 fps, becuase though my experience with testing bolts, the range was about 20 fps between flow/valve port seal/front oring seal using a cocker. so with a mag we are only talking about the front oring, which wasn't nearly as large as valve port sealing and flow restrictions.

[Newt]

I got a feeling the the mag's lack of air efficiency is not due to the way the lvl 10 seals with the barrel...

when was the last time you ran out of air in one game? what field wont offer all day air?

yeah I have to fill my tank more then the kiddies using the Ion's. But I still own them

Sure, but that's not the issue at all. Air efficiency isn't for getting more shots on a tank unless you're playing outlaw a 1/2 hour drive from the nearest fill station (but then, most of us do occasionally).

Air efficiency is for increasing fps with the same pressure. That translates to a lower operating pressure (in the on/off, after the reg) which quiets the shot, puts less deformation on the ball, and leaves more gas for trigger reactivity.

We could probably test a decent force fed hopper and find that working against blowback up the feedneck also uses battery life faster, but that's really about as moot as tank fills.