Anyone no where i can buy a new buffer for my fx-9
- Thread starter LONEWOLF
- Start date
I run one of the adjustable Lockhart tactical Raven PCC ones in mine, works really well. It’s a little pricey but having the ability to adjust the weight is really nice. You also need an extended buffer tube since the buffer is longer than a Mil spec. TNA sells extended length ones.
My buffer is currently 10.7oz vs 3oz factory, makes the recoil almost non existent.
My buffer is currently 10.7oz vs 3oz factory, makes the recoil almost non existent.
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Hmm interesting, mine wouldn’t lock the bolt back with the standard length. It was just to say too short
Heavier buffer like the one mentioned above is one route.
From the research I have done the sweet spot for any straight blowback 9mm is combined weight of ~22 oz. From memory the FX9 bolt is 11 ounces (don't recall what the stock buffer is but it was on the light side for the 22 oz target I had)
In the end I went with a Kynshot hydraulic buffer and 2 weights (needed longer tube to fit it all in) and flatwire spring. This combo got me to exactly 22 oz.
I have ran ammo from 130PF to 175PF through it and the recoil is almost non existent.
The other route you could go is with a delayed blowback system of some kind. These don't need as much weight to run correctly as the locker mechanism does some of the work the weight would do and resists / holds the bolt from moving when the cartridge is first fired. I would love to try one of these as I suspect that if setup correctly would be the lightest recoiling / best feeling all round system on offer (this is what the MP5 uses and it is the gold standard all other guns are compared to).
From what I can tell the only downside with roller delayed is that it overcoming the locker mechanism will make pulling the charging handle heavier.
From the research I have done the sweet spot for any straight blowback 9mm is combined weight of ~22 oz. From memory the FX9 bolt is 11 ounces (don't recall what the stock buffer is but it was on the light side for the 22 oz target I had)
In the end I went with a Kynshot hydraulic buffer and 2 weights (needed longer tube to fit it all in) and flatwire spring. This combo got me to exactly 22 oz.
I have ran ammo from 130PF to 175PF through it and the recoil is almost non existent.
The other route you could go is with a delayed blowback system of some kind. These don't need as much weight to run correctly as the locker mechanism does some of the work the weight would do and resists / holds the bolt from moving when the cartridge is first fired. I would love to try one of these as I suspect that if setup correctly would be the lightest recoiling / best feeling all round system on offer (this is what the MP5 uses and it is the gold standard all other guns are compared to).
From what I can tell the only downside with roller delayed is that it overcoming the locker mechanism will make pulling the charging handle heavier.
This!!!!
I rund the same and there is no recoil what so ever with 1100 fps (132pf), the dot on the rifle doesnt move.
My overall weight of BCG and buffer and weights is 23.5 ounces, the sweet spot I see.
That is with a light grip also
AlphaCharlieDelta
Member
- Location
- The Wet Coast
Between 21 and 24oz of total reciprocal mass is the window you wanna be in, the closer to 24oz the better. To get that number you need to weigh your bolt without the charging handle (average FX9 bolt is 12oz, mine is 12.4oz), the Kynshot RB5015HD is 6oz, add two spacers at 2.5oz each (5oz total), and you've got 23oz which in my experience is as close to perfect as you can get. Like Madcow said, hardly any recoil at that point. Add a good comp like the Davinci diesel slant or the P3 specialties comp, and load up some campro 121gr over 3.4 tight group (about 130-134pf) at 1.12oal and you will have ZERO dot bounce, almost no recoil, and hella accurate out to 100.
You can spend as much or as little as you want on a buffer. The cost of some of the stuff out there seems outrageous to me.
Your stock buffer has weights in it. Weights come in aluminum, steel and tungsten. Tungsten being the heaviest. If you want to make an H1 buffer all you need to do is replace one of your weights with 1 tungsten one. For H2, you do 2 tungsten, for H3 you do 3 tungsten. The tungsten weights can be ordered from a couple different places - not super common to find them in Canada but certainly not unobtainable.
I run mine with an H2 setup and a heavier spring (Giessele Super 42 spring).
Your stock buffer has weights in it. Weights come in aluminum, steel and tungsten. Tungsten being the heaviest. If you want to make an H1 buffer all you need to do is replace one of your weights with 1 tungsten one. For H2, you do 2 tungsten, for H3 you do 3 tungsten. The tungsten weights can be ordered from a couple different places - not super common to find them in Canada but certainly not unobtainable.
I run mine with an H2 setup and a heavier spring (Giessele Super 42 spring).
AlphaCharlieDelta
Member
- Location
- The Wet Coast
Yeah mine is 23.4oz total. Sure smooths everything out.... might try the extended JR carbine buffer tube next season so i get the benefit of the lrho for those option 3 starts and unloaded table starts.
The graph paper highlights how little movement there is pretty well.
Hard to believe my PCC sat in stock form / unfired for ~18 months cos I was jaded from a previous 9mm that was a hunk of junk and now it is one of my favourite / most used guns.
They are a LOT of fun.
AlphaCharlieDelta
Member
- Location
- The Wet Coast
Yup, the load with the comp, and the hydraulic buffer system changes it from a fun range toy to a very capable competition PCC (
warning: user error can and will diminish results... Especially when under the clock).
Madcow and a few others of us across the country have been doing research all year and trying to share it with anyone who wants to listen. PCC is NOT a crime!!
warning: user error can and will diminish results... Especially when under the clock).Madcow and a few others of us across the country have been doing research all year and trying to share it with anyone who wants to listen. PCC is NOT a crime!!
