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Discussion Starter #1
So Im thinking about grabbing a Geiselle rail and Super 42 for my 10.4. Does anyone know if the Super42 braided will run ok with the 10.4s or is it just one of those gucci pieces that will be left to the friendly DI guys. Also I wanted to know if I need to do anything in specific to put the rail on, I remember hearing some modification needs to be done to make this work?
 

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I am finding that the Super 42 is about like running an H2 Buffer and Springco extra power in my Colt 14.5". What this tells me is that this setup is more in line for running in a slightly over-gassed/suppressed DI gun rather than putting up with what is required for running an HK. Since my DI guns won't reliably cycle on an HK buffer/buffer spring, I'm to deduce that the Super 42 spring and proprietary buffer are too weak for the HK. The Vltor A5 configurations (typically the 2 heaviest) are meant for piston/suppression use. Stick with the HK standard or Vltor.

For the rail, you need to cut the sling loops off a 416 upper (no mod needed for MR556).
 

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Discussion Starter #7
I am finding that the Super 42 is about like running an H2 Buffer and Springco extra power in my Colt 14.5". What this tells me is that this setup is more in line for running in a slightly over-gassed/suppressed DI gun rather than putting up with what is required for running an HK. Since my DI guns won't reliably cycle on an HK buffer/buffer spring, I'm to deduce that the Super 42 spring and proprietary buffer are too weak for the HK. The Vltor A5 configurations (typically the 2 heaviest) are meant for piston/suppression use. Stick with the HK standard or Vltor.

For the rail, you need to cut the sling loops off a 416 upper (no mod needed for MR556).

I know you can buy extra weights for the Geissele. I was thinking about gettting all the additional weights and running it as an H3/H4 set up
 

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I believe mine came with one tungsten, 2 steel and I bumped it up to 2x tungsten and one steel. I think the highest you can go is all 3 tungsten which may barely be enough for the buffer, but I still think that leaves you with a comparatively weaker spring than the HK

Hey, your gun...you're money.
 

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Discussion Starter #9
Ok so if I go with a receiver extension then what should I look for as far as buffer spring/ buffer. I want to make sure my AF runs reliably suppressed and under suppressed
 

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Ok so if I go with a receiver extension then what should I look for as far as buffer spring/ buffer. I want to make sure my AF runs reliably suppressed and under suppressed
I'm pretty sure I'm running a 10z and a Wolff heavy spring from Heavybuffers.com... so far it runs well for me but I also have a plugged 10.4 gas block. I can't imagine it'll be any different with the vented plug but I'm not 100% sure.
 
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