I really hate my B&T SPC9. Help me find a replacement 9mm PCC

AlphaCharlieDelta said:
9mm blowback are not over gassed...they are direct blowback. Can't be over gassed without a gas block and gas system.
It's the design of a direct blow back system, it uses the gas from the cartridge ignition to propel the bolt backwards. Unless you buy a left handed rifle set up, there will always be gases that will come out of the ejection port on the right hand side of the rifle. Some are better than others, but it will always be an issue to some degree with all right hand set up direct blowbacks used by lefties.
I would recommend a JR Carbine as they are the only PCC I know of that can be made full lefties set up
Click to expand...
Overgassing is a term used on more systems than just DI… in blowback we use it to describe any situation where there is excessive rearward force on the bolt. That’s due to at least one of 4 things;

1. Barrel is too long
2. Ammo is too hot
3. Reciprocating mass is too light
4. Recoil spring is too weak

That results in more than necessary recoil force and higher chance of OOB detonation since the system doesn’t have the force needed to keep the brass chambered before the pressure has dropped to a safe level. As I said most factory blowback PCC’s are overgassed because the manufacturers would rather risk long-term parts breakages over every second rifle coming back for warranty because it was having feeding or extraction problems. The FX9 can still function with 100% reliability with a buffer 6+oz heavier than stock, meaning that the rifle is “overgassed” from the factory.

I realize you misunderstood what I meant by overgassing since that’s usually a DI/piston term but trust that I know what I’m talking about here. I solved the issue for myself and I’m trying to solve it for OP.
 
9.3 Hunter said:
JR can be setup to deflect casings on the left...
Click to expand...
Yup, move the ejector/cover to the left, flip the bolt over, and it ejects left. I've never had an issue with gas in the face either.

For what it's worth, every stock FX-9 I've come across throws ALL KINDS of junk out of the ejection port when it cycles. ROing someone shooting one is the worse, you get peppered with sh!t every shot. You could probably get past that by putting a heavier buffer in (They're very light factory, IIRC), but just an FYI.
 
AOWM said:
The CON and great weakness with mine has been that the last round hold open pretty much does not work, have tried many brands of mags and put some time into lightning the spring and smoothing the bolt catch. Works best with factory Glock mags but still only about 80% at best.
Click to expand...
The guy I bought mine from said the same thing about the last round hold open. I bought his mags(Magpul) too and I managed to diagnose the problem and now mine runs 100%. You might want to disassemble and take a look and see if it might be the same issue. It's an easy fix.

The way FO makes the bolt catch is that the paddle on one end, and the flange that interfaces with the mag follower are welded onto a rod. The problem on mine was that the pieces were welded just slightly on the wrong angle. This meant that while the followers were interfacing with the flange properly, it wasn't rotating the whole assembly far enough to actually have the paddle end catch the bolt. All I did was heat the middle of the rod with a propane torch and with 2 pairs of pliers twisted the part gently until the ends were squared up. If you need DM me and I can draw you a diagram of what I'm talking about.

@OP: I like my FX9 but as others have said you're definitely going to want to try one out first. I've have shot it left handed, but I'm also one of those guys who've gotten too used to ####ty government contract equipment that blows debris in my face, so I can't give a straight opinion on whether or not that's an issue. And yes load choice and buffer tuning do make a huge difference in that as I've read online.
 
ADHD said:
Overgassing is a term used on more systems than just DI… in blowback we use it to describe any situation where there is excessive rearward force on the bolt. That’s due to at least one of 4 things;

1. Barrel is too long
2. Ammo is too hot
3. Reciprocating mass is too light
4. Recoil spring is too weak

That results in more than necessary recoil force and higher chance of OOB detonation since the system doesn’t have the force needed to keep the brass chambered before the pressure has dropped to a safe level. As I said most factory blowback PCC’s are overgassed because the manufacturers would rather risk long-term parts breakages over every second rifle coming back for warranty because it was having feeding or extraction problems. The FX9 can still function with 100% reliability with a buffer 6+oz heavier than stock, meaning that the rifle is “overgassed” from the factory.

I realize you misunderstood what I meant by overgassing since that’s usually a DI/piston term but trust that I know what I’m talking about here. I solved the issue for myself and I’m trying to solve it for OP.
Click to expand...
Under buffered is more accurate with direct blowback lol. That 21-24oz sweet spot sure makes a difference.
 
Last edited:
I just ended up building a "blast shield" on my fx9 using a piece of belt and a couple zipties anchored to the elcan.... It is ghetto looking, but works especially when shooting with the offset sight.
 

Attachments

  • IMG_20241205_012315868.jpg
    IMG_20241205_012315868.jpg
    90.5 KB · Views: 25
  • IMG_20241205_011933313.jpg
    IMG_20241205_011933313.jpg
    76.2 KB · Views: 25
AlphaCharlieDelta said:
Pretty sure you can't switch the ejection port to the left hand side on the Raven ..so it might be somewhat left hand friendly, but not a designated left hand set up like the JR Carbine.
Click to expand...

No, but as a lefty who has used both the FX-9 and the Raven I can say its been my experience that the latter is considerably more friendly in terms of ejection and propellant gases.

If left hand ejection is important, the TNW ASR is another option.
 
Have you tried shooting it outside? Its possible that because your indoors and maybe the venting at your range is not the best your getting blasted... I think if you were outdoors with a mild wind or breeze like most days you would be fine. Also I know its a blow back but i dont think it would hurt to try a different muzzle device maybe something that doesn't have so much back pressure and pulls gas out the barrel better
 
Someone76239 said:
Have you tried shooting it outside? Its possible that because your indoors and maybe the venting at your range is not the best your getting blasted... I think if you were outdoors with a mild wind or breeze like most days you would be fine. Also I know its a blow back but i dont think it would hurt to try a different muzzle device maybe something that doesn't have so much back pressure and pulls gas out the barrel better
Click to expand...
Does it matter any more?
 
I shoot left and have the Ruger PC. Great firearm. 1000's of rounds fired and 0 issues with: 115, 124, 138 and 147 grains. I've never owned a left handed firearm. From the FNC1 in the military to my Ruger American Ranch 5.56. All right eject and right safety.
 
You must log in or register to reply here.
Back
Top Bottom