Tuning New Impact M3 compact - valve adjuster hits shroud

Converted my M3 to a .22 Compact and noticed the same thing. I have no machinery to fix it, but at least I know I'm not the only one.

id sure contact fx usa have them fix the issues and send out shrouds for others thats correct size 

Yes, bad design on the shroud. I believe all Compacts do the same. Mine does too.

Would a washer inside the shroud allow it to seat firmly a little farther forward?

Sorry, I started writing my post(below), walked away to have lunch, came back and finished the post but didn’t see your last post about shortening the shroud. That’s what I would have done too, no big deal. Glad you got it figured out. The other option would be to get one of the older knobs and shorten the front of it. Then the M3 knob could be put back on if you wanted.

This has been discussed here a few times and FX has been made aware. Too bad, that sucks for sure. If it were my air gun, I’d just modify the shroud and make it work, no biggie. It’s very hard to see under there anyway. If you were to do a good job and paint it black when you’re done, nobody would ever even notice it, unless inspecting your gun. Even then, they probably wouldn’t see it if you do a good job. That’s me though, I’m sure many would not want to do that to a $2200 Impact or don’t think they should have to. The other option is live with it or wait for a replacement shroud. Have a great weekend.

Stoti





This is the original knob I suggested you could modify,

although, I don’t even know if it would work?

Would the Shroud cone from the Sniper or a bushing between the shroud and rear support B11 werq? 

I purchased a .22 caliber change kit for a compact and was pretty pissed when I noticed this as well. At least I know I’m not the only one. 

I just checked mine, and it is the same as all the other ones shown.

Based on my settings it hadn't Impacted my tuning or use of the gun, but now I'm p!ssed.

I'm shooting 22gr slugs in mine (.22]. I was trying to get to 930 fps using a tune from the South African guys, except my 1st reg is 200 instead of their 180. I only got 870 fps, but after increasing the macro wheel from 6 to 8, and the hammer spring from #2+one click to 2.5, I was at 928fps and very accurately. The valve setting they were using was just under 3 lines. That's where I set mine and left it. Of course at under 3 lines, I am nowhere near hitting the shroud. I shot it at 25 yds for accuracy before going farther (which I have not done yet) as recommended by Ted Bier and or Bob O. I don' think the accuracy will be a problem.

I don't own one of these but my mechanical intuition kicked in with a little idea to throw out there - would it be easier just to put a heavier chamfer on the end of the knob and touch up with some cold blue or black paint?

I think modding the knob would be easiest. Even a guy like me with no lathe could send it to someone with one rather inexpensively. Maybe someone will come out with some custom knobs like they did with the cocking handles.

I have the same issue with all my non-cone shroud. FX need to make some modifications to the liner lock so the shroud will bottom out and give enough clearance for the valve adjuster. 

I have the same issue on my M3 .25 Compact i purchased

I have a caliber change kit for my M3, and the 600mm .30 cal shroud also hits the valve adjuster knob right at the 4th line.

kiba said:

Was changing the liner, mod, bottle, and a couple other things on my new M3 compact last night and noticed something interesting... The factory shroud is too long and won't allow you to open the valve adjuster all the way.

On a 4 line valve housing, full open is 1.5 turns past the 4th line. However on my compact the knob hits the shroud at about 3.5 lines... See the pic below.

View attachment 180425

The fix was to put the shroud in the lathe and remove 0.050" from both ends for total of 0.100". You can't remove all 0.100" from a single end as there isn't enough internal thread length on the shroud and the cap would run out of thread before the shoulder seats against the shroud.

After removing the 0.050" from both ends, you can now open the valve adjuster to the full open 4 line + 1.5 turns and still have additional clearance between the knob and the shroud.

Just something you need to watch for on an M3 compact if you aren't getting the muzzle energy you think you should be, having the valve limited to 3.5 turns open can certainly limit output on a higher energy tune.

Click to expand...

Replace the shroud end with the cone style and that will eliminate the problem