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Discussion Starter · #1 ·
I am upgrading my l96 and wanted to get a pdi hop up. The stock hop up for my l96 is destroyed so no chance of just adding an r hop to the stock hop up.

But what I am asking is, will the two adjustment bars for the pdi hop up work with the r hop mod?

Thanks
 

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Anybarrel with a hopup window cut into it accepts the r-hop. Just make sure the hopup arms have a flat nub as long as the r-hop itself. It will work with the normal nub but not as well. I'm not sure how to mod the pdi units as I have no experience with those though.
 

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Anybarrel with a hopup window cut into it accepts the r-hop. Just make sure the hopup arms have a flat nub as long as the r-hop itself. It will work with the normal nub but not as well. I'm not sure how to mod the pdi units as I have no experience with those though.
Nicely said buddy. I would figure the PDI would be the same setup in a sense and any houpup will work since its mostly a inner barrel and bucking mod.
 

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I've never opened my PDI hop unit, but I know it's adjusted by two seperate arms.
And I have no idea what the internals of the unit look like, but would each arm need a separate hop nub? Would it just be one big nub?

Ive wondered this as I'm looking into getting an ER hop setup for PDI hop in my l96.
 

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You only need one large nub. My understanding of how the pdi unit works is the two arms act as one and push down on a single nub. I have no doubt it will work with the pdi unit, so get the chamber, open it up and find out how it works. Basically what you need to do is make a larger nub so instead of pushing on a single spot it will have more surface area.
 

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Discussion Starter · #7 ·
Thanks for the input. Is the hop up nub for the r hop mod supposed to run parallel to the inner barrel? Do I NEED to buy the M nub, and if not, do I need to do anything 'special' for the pdi hop up besides installing the r hop to the inner barrel like any normal r hop installation?

Thanks
 

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You will need to enlarge your hop chamber window, and you will need to use a soft nub. The two arms working in tandem is a royal PITA to adjust with an R-hop, I usually use either one single arm shimmed to center, or use the arm I have on shapeways (on my website, in my sig), that is the two arms combined into 1. I can do any or all of these things for you, click on my sig.
 

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Yeah, I've hear of the few different mods for the PDI hop to change the arms into one, etc. I can imagine it being a pain like you mentioned with the r-hop, it's already tedious enough having to take out the mag every time and having to flip the gun over to just to get to and adjust the little screws. Although the dual arms has worked quite well with my w-hold bucking. And I'm definitely interested in getting an er-hop set-up going, so I'll be sure to hit you up once I get some funds together.

Another question, if an er-hop was to be installed in the PDI chamber, does it need to be "extended" in anyway like aeg hop units do? Not the barrel, I mean the actual hop unit, I'm sure you know what I'm talking about.
 

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Discussion Starter · #14 ·
So do i have to do more work to get the r hop to work in a pdi hop up chamber? I know for any 'normal' hop up you are putting an r hop into, you just have to sand down the r hop to fit into the barrel nicely. So would just doing that not work for the pdi hop up? How much time i have to put into this determines whether or not to get an r hop with my pdi hop up.
 

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It would also be a good idea to get the new nub. Make it as long as the r-hop patch is ans somewhat soft. Cheese once told me to use nerf dart foam cut to the right shape and it works perfectly for me. I can't tell you how to go about doing this because I don't have too much experience with the pdi chambers though. But other than that you just install the barrel as you would normally, with the shaved mound bucking over the r-hop to provide the air seal.
 

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You can use whatever bucking you want but the hard one is actually recommended because it gives the best air seal. You want the nub to be soft-ish because it will give the most even pressure along the r-hop.
 
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