FX Impact M4

[Vetmx]

Yeah I was surprised as well when I figured that I’m locked at 135ish. Then looked into it and found a bunch of others who also reported to be maxed out with stock hammer anywhere between 130 to 140b… not a big deal and a gram or two more hammer will solve, just something to consider…

It’s quite simple. 700mm vs 500mm. They are completely different animals.

 

[zerochance]

Interesting… I’ll get an opinion from UA and see what they say too. If anything ill have to sell my pellet shooter .25 Maverick and replace it with the M4. This way I’ll get a bullpup, 1 reg, and the quick tune system. Lol.

 

[greenbeans]

It’s quite simple. 700mm vs 500mm. They are completely different animals.

Fair enough. Didn’t expect them to put different hammer/spring in there but it would kind of make sense

 

[6gun]

Yeah I was surprised as well when I figured that I’m locked at 135ish. Then looked into it and found a bunch of others who also reported to be maxed out with stock hammer anywhere between 130 to 140b… not a big deal and a gram or two more hammer will solve, just something to consider…

My 700 topped out with factory hammer around 135 bar too. I out a tungsten hammer in it and it's a little too much for the 150 I needed to run.

 

[6gun]

Interesting… I’ll get an opinion from UA and see what they say too. If anything ill have to sell my pellet shooter .25 Maverick and replace it with the M4. This way I’ll get a bullpup, 1 reg, and the quick tune system. Lol.

Wait till you see how much easier a mav hammer change is compared to an impact.

 

[Jim B]

I just got my M4 600mm in the mail yesterday, I have the reg set at 115 macro @16 and micro on 4 and I am pushing the Zan 26s slug @965 and the FX 34 grn pellet at 876 in .25 cal I get 85 shots on a 250 bar fill. I am keeping everything stock at this point. The gun shoots great, the pellet groups are really tight sub MOA at 50 and 75 yards and .35 inches at 25 center to center, the slugs I need to spend more time with, I am not sure if the tune isn't right or they are finicky to the hold.

 

[Vetmx]

Fair enough. Didn’t expect them to put different hammer/spring in there but it would kind of make sense

It’s not about a 500mm having a different hammer or spring. We don’t have to push a projectile down a 700mm barrel. If you put a 500mm barrel on your gun right now, 135b will no longer be your tuning max. It will be 150b.

 

[greenbeans]

It’s not about a 500mm having a different hammer or spring. We don’t have to push a projectile down a 700mm barrel. If you put a 500mm barrel on your gun right now, 135b will no longer be your tuning max. It will be 150b.

Hmmm I don’t understand that tbh… if the plenum pressure is too high so that the current hammer/spring can’t open the valve anymore, what does the barrel length change?! Or are you saying that higher back-pressure out of the longer barrel will close balanced valve faster?! Would have thought that the barrel length would have that much of an impact on that but could be, happy to learn something new…