FX FX M4 Slug liner?

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Jgarret7

Jgarret7

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Jul 31, 2025
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Midkiff, TX
I recently purchased a new M4 with 600m barrel and had it tuned for heavy pellets from Utah air guns. It arrived yesterday and i am anxious to get going. However I am on a business trip and it will be a few day till i am home. For the time being I am trying to learn all i can that will better my experience. I am starting to think i should have went with the heavy slug tune instead and purchased a liner for the type of shooting i intend on doing. We have a few ranches here in Texas and I love to predator hunt as well as hogs. I also dabble in long range with my powder burners. I have several stands at the 80-200 yard mark with an abundance of hogs coming in daily. Also have a range capable of shooting far past what any pcp will do. With this in mind, do i just buy the barrel kit, or the sleeve itself? Do i need to go with a heavier spring also? Any help or direction is appreciated.
 
Jgarret7 said:
I recently purchased a new M4 with 600m barrel and had it tuned for heavy pellets from Utah air guns. It arrived yesterday and i am anxious to get going. However I am on a business trip and it will be a few day till i am home. For the time being I am trying to learn all i can that will better my experience. I am starting to think i should have went with the heavy slug tune instead and purchased a liner for the type of shooting i intend on doing. We have a few ranches here in Texas and I love to predator hunt as well as hogs. I also dabble in long range with my powder burners. I have several stands at the 80-200 yard mark with an abundance of hogs coming in daily. Also have a range capable of shooting far past what any pcp will do. With this in mind, do i just buy the barrel kit, or the sleeve itself? Do i need to go with a heavier spring also? Any help or direction is appreciated.
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The liner is easy to swap with a 10mm end wrench. What caliber did you get? I have 22 700mm m3, and if you want to do a weak rimfire but shoot long range slugs are cool. The issue is how much of a pain and near full teardown an impact is to change the hammer weight. Once you go tungsten you're stuck with high power.


Will you want to ever shoot pellets with it? Mine can only shoot heavy pellets with the heavy liner. Anything light spirals off into the next state, but this is 22.
 
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Jgarret7 said:
I am new to to pcps, but I have bought a few in the last couple weeks. Huben gk 1 in .25 that i have a folding stock coming for it ( truck gun ) and a notos .22 for my son. Have my eyes on a few others... Wouldn't mind having a dedicated slug setup and I think the M4 is in the lineup for that role for now.
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What cal is the M4 now and what cal slugs would you like to entertain? Are you looking to get coyotes, skunks, racoons, small hogs?
 
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If you're looking at reaching out past 100 yards, then slugs and a slug liner is the way to go. Liner changes are easy and you'll always have a pellet liner should you wanna go back, or you could sell fairly easily.

600-700mm barrel is ideal for long range, get some decent slugs and have at it.

Just for nfo, I shoot 22 MRDs at 900fps, sometimes a bit faster out to just over 100yds, 30fpe @ 100 is probably enough to kill a lot of smaller stuff.
 
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bchannell said:
If you're looking at reaching out past 100 yards, then slugs and a slug liner is the way to go. Liner changes are easy and you'll always have a pellet liner should you wanna go back, or you could sell fairly easily.

600-700mm barrel is ideal for long range, get some decent slugs and have at it.

Just for nfo, I shoot 22 MRDs at 900fps, sometimes a bit faster out to just over 100yds, 30fpe @ 100 is probably enough to kill a lot of smaller stuff.
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The hammer weight change is the worst of it. A liner change and probe change is a matter of minutes, which even surprised my shooting partner that thought it was surgery.
 
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6gun said:
The liner is easy to swap with a 10mm end wrench. What caliber did you get? I have 22 700mm m3, and if you want to do a weak rimfire but shoot long range slugs are cool. The issue is how much of a pain and near full teardown an impact is to change the hammer weight. Once you go tungsten you're stuck with high power.


Will you want to ever shoot pellets with it? Mine can only shoot heavy pellets with the heavy liner. Anything light spirals off into the next state, but this is 22.
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to answer your question. MY m4 is in .30 cal
 
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If you have a modicum of mechanical intuition the hammer weight change is not bad at all. There are plenty of videos on line that will walk you through the process.
IF you want slugs chances are you are also wanting higher FPE levels and for that you need speed and heavier slugs so the heavier hammer is going to be needed. I would avoid the tungsten hammer as it is usually more than what is necessary.
 
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Jgarret7 said:
Is the hammer weight change necessary?
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Not always, the different calibers often come with different hammer weights for the factory. Mine being 22 and me chasing max power I did the tungsten hammer. I do recommend you have a chronograph and just take notes and quantifiable measurements of your gun settings first since you bought a tune and then mess around a bit and see where your hammer maxes out for plenum pressure capability. You can find what she can really do in stock form. If you can get 80 foot pounds I think you're in business for baby hogs and I know your gun can do more than that.

I don't want to overwhelm you yet with too much data, but id buy some of the lighter 30 slugs that interest you and try them out of the pellet liner. I could shoot the majority of the bottom half of the slug weights really well with my pellet liner to at least 100. Then elr hunting bit me and I needed to stabilize a better bc and the tungsten hammer for valve dwell and 150 bar came in for my 700mm. That it does but it's somewhere between the fun of a pellet gun and the safety concerns of a rimfire. I stopped the research at a good accuracy node and for noise and capability was good for me at 75 foot pounds. Good enough to shoot thru some moderately weathered 1 inch cdx plywood on accident with a 60 yard shot.

I usually talk people down off the slug wall, but you have the land and the use, it just takes away the fun of a quiet efficient laser plinker sometimes. That's why there's more guns.
 
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Chukar60 said:
If you have a modicum of mechanical intuition the hammer weight change is not bad at all. There are plenty of videos on line that will walk you through the process.
IF you want slugs chances are you are also wanting higher FPE levels and for that you need speed and heavier slugs so the heavier hammer is going to be needed. I would avoid the tungsten hammer as it is usually more than what is necessary.
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There's a little 3d printable tool that helps. My distaste for the process is the opportunity for the rail and top strap to misalign. That issue was resolved in the M4 tho.

I'd recommend doing your reading and upgrade or modify anything you might want to with the gun torn down to that level. The slippery slope car guys know as "while I'm here, racecar parts"

Tastes vary but I didn't care for the shot experience of the heavier spring, I'm a heavy hammer preferring dude.
 
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6gun said:
Not always, the different calibers often come with different hammer weights for the factory. Mine being 22 and me chasing max power I did the tungsten hammer. I do recommend you have a chronograph and just take notes and quantifiable measurements of your gun settings first since you bought a tune and then mess around a bit and see where your hammer maxes out for plenum pressure capability. You can find what she can really do in stock form. If you can get 80 foot pounds I think you're in business for baby hogs and I know your gun can do more than that.

I don't want to overwhelm you yet with too much data, but id buy some of the lighter 30 slugs that interest you and try them out of the pellet liner. I could shoot the majority of the bottom half of the slug weights really well with my pellet liner to at least 100. Then elr hunting bit me and I needed to stabilize a better bc and the tungsten hammer for valve dwell and 150 bar came in for my 700mm. That it does but it's somewhere between the fun of a pellet gun and the safety concerns of a rimfire. I stopped the research at a good accuracy node and for noise and capability was good for me at 75 foot pounds. Good enough to shoot thru some moderately weathered 1 inch cdx plywood on accident with a 60 yard shot.

I usually talk people down off the slug wall, but you have the land and the use, it just takes away the fun of a quiet efficient laser plinker sometimes. That's why there's more guns.
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Exact info I was looking for. I have seen where most advice against going down the slug rabbit hole. But that is ideally why i got the impact. IMO ignorant newbie opinion, the impact fits the bill to be pushed to distance and ELR. I do have a chrono and push over 1000 yards regularly with powder burners. I also reload so I am somewhat used to the technical side of shooting. I am already building up an additional arsenal for plinking. Putting together a couple of NOTOS for my son and I. Also have a huben GK 1 that I am configuring in a carbine format for a truck rig. would like to pickup a Karma SLS, Brocock Sanoran and a Western Mordax in the next couple months. Will also need a big bore and thinkin a something from Texan will do for close on big hogs...
 
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Jgarret7 said:
Exact info I was looking for. I have seen where most advice against going down the slug rabbit hole. But that is ideally why i got the impact. IMO ignorant newbie opinion, the impact fits the bill to be pushed to distance and ELR. I do have a chrono and push over 1000 yards regularly with powder burners. I also reload so I am somewhat used to the technical side of shooting. I am already building up an additional arsenal for plinking. Putting together a couple of NOTOS for my son and I. Also have a huben GK 1 that I am configuring in a carbine format for a truck rig. would like to pickup a Karma SLS, Brocock Sanoran and a Western Mordax in the next couple months. Will also need a big bore and thinkin a something from Texan will do for close on big hogs...
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OK, we are really similar. I just don't have any guns that lend to 1k yards, but lots of esoteric stuff, ive loaded and cast since the early 2ks. The beauty of the impact is that it's the reloading bench and the gun in 1.

If you want to chase those slugs you'll probably be doing the tungsten hammer weight, heavy liner, slug probe to control seat depth and get a little extra flow and potentially the carbon tensioner. All things I did in my pursuit of a quiet air powered 22long with 22 hornet bc ranges.

While we are here, racecar parts. Take a look at the dnt zulus. Range finding, ballistics solving, day night optic. If you get your velocity down perfect, this optic makes you a varmint weapon. This is where mine ended up for doing 150 yard + squirrels.

20250312_092135.jpg
 
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6gun said:
OK, we are really similar. I just don't have any guns that lend to 1k yards, but lots of esoteric stuff, ive loaded and cast since the early 2ks. The beauty of the impact is that it's the reloading bench and the gun in 1.

If you want to chase those slugs you'll probably be doing the tungsten hammer weight, heavy liner, slug probe to control seat depth and get a little extra flow and potentially the carbon tensioner. All things I did in my pursuit of a quiet air powered 22long with 22 hornet bc ranges.

While we are here, racecar parts. Take a look at the dnt zulus. Range finding, ballistics solving, day night optic. If you get your velocity down perfect, this optic makes you a varmint weapon. This is where mine ended up for doing 150 yard + squirrels.

View attachment 584177
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Very funny you mention the zulus... I have had my eye on DNT for quite a while. I have a Rix L6 and a nocpix SLim l35 that I really like for thermaling. But I have really been wanting to try the day/night digital rigs. The onboard ballistics seems like a game changer. MY L6 has it but the LRF isnt integrated and is rather blulky and annoying with the side mount. I almost bought a thermnight 335 last week but had bought the Huben instead. Almost bought the Zulus yesterday but trying to decide if i want the 3-12 or 5-20. Almost certain on the 5-20. Yours is the 5 -20?
 
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Jgarret7 said:
Very funny you mention the zulus... I have had my eye on DNT for quite a while. I have a Rix L6 and a nocpix SLim l35 that I really like for thermaling. But I have really been wanting to try the day/night digital rigs. The onboard ballistics seems like a game changer. MY L6 has it but the LRF isnt integrated and is rather blulky and annoying with the side mount. I almost bought a thermnight 335 last week but had bought the Huben instead. Almost bought the Zulus yesterday but trying to decide if i want the 3-12 or 5-20. Almost certain on the 5-20. Yours is the 5 -20?
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Ya, mine is a very early release 5-20 lrf when arken was attempting to handle it.
 
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