FX FX M4 low speed in the first shot
- Thread starter ortanyeri
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As an impact owner myself, welcome to known impact issues. It can be less problematic if you tune it in a specific way.
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Tuning - FX Impact Mk2/M3 - slower first shot - no reg creep - quasi-scientific analysis
The FX plenum end part has a 1,5 mm hole. I don't think enlarging that hole will help much in refresh rate since the regulator flow is the bottleneck.
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Pretty sure FX has a new updated valve rod part so at least you can fix your brand new 2200-2400 dollar gun.
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these o-rings are supposed to fix this problem from getting slow shots , I hope this helps
and while your in there this kit has all the o-rings you need for just a few more dollars
FX IMPACT M3-M4 VALVE ROD ORINGS NEW DESIGN | Accu-Shot Orings
new designed valve rod orings made from new compounds eliminates valve rod drag like the original orings which takes 8-10 shots to get to target speed. new sized and compound orings eliminate valve rod drag secondary oring holds the valve rod firmly in place resulting in consistant shot counts...
www.accu-shot-orings.com
and while your in there this kit has all the o-rings you need for just a few more dollars
FX IMPACT M3-M4 New Design plenum Oring kit | Accu-Shot Orings
new design valve rod orings elimanate having to cold fire your impact to get up to target speed. unlike the original fx oring which drags on the valve rod like a windsheild wiper on a dry windsheild for example. new size and compounds eliminate any drag resulting in consitant shot counts from...
www.accu-shot-orings.com
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That’s clearly a problem with the gun. With my M4, if I don’t shoot for a day, the first shot’s muzzle velocity is 50–100 FPS lower than the previous day. It takes about 5–10 shots to get back to the preset velocity. I have many friends who’ve bought FX guns, and several of them have experienced the same issue. Yet FX considers this normal. I’ve already traded mine for a different gun. For a rifle that costs over two grand, this is unacceptable. I’ll never buy FX again.
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This also happens with the FX King .22, at least with my unit, the first 4-5 shots are slower, it's not just a problem with the Impact.
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I have an M3 in .30 cal. The first 3 or 4 shots are always low at 100 yards. I've never measured the velocity but I assume it's low too. After that, it shoots normally all day. I just expect that the innards are getting loosened up.
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