M*CARBO Brotherhood

Full Length Forend

Basically this

Take two of these. Add a couple screw holes in the thicker section.
Makes a clamp on block that the hand guard would then clamp on to.
There is a small ridge on the S2K barrel nut that a groove needs to be made for.

I may give it a try in TPU when I get my printer.

EDIT: Of course you would need to get proper dimensions from whichever hand guard you choose to use.

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Just mounted the 420 to my Gen 2 and so far I like how it looks and feels. Just need to figure out a flip out mount for my red dot, so I can fold it.

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I have my new printer. I’m running it right now. I’d like to share the STL files if anyone is interested.
This is a huge learning project for me. First time with CAD and first experience with 3D printing.

Maybe we should have a 3D thread all on it’s own. I’m sure there are a lot of great ideas out there.

Anyways, this is a two piece adapter that allows the use of free float handguards.
The inner part should remain the same, if I designed it correctly, for all 9MM.
The outer dimensions will need resizing depending on the inside diameter of the forend.
I’ll post the results in a few hours when it’s done and I’ve checked the fit and finish.

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Can’t wait to see. If it works I would probably switch out my 420 to a free float.

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So my design was slightly off, hence the gap in the bottom picture.
But that would actually work well for a clamp on hand guard.
I don’t currently have a spare clamp on hand guard to test it.
Nor do I feel like removing my front sight.

Great experience gained, however, so I’m happy with the results.
The print quality could have been better, but I had it set low for speed.
Still took an hour for each piece.

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@ValorSolo

Amazing research and valiant effort to follow your dreams of building the perfect SUB-2000 for your own personal liking!!! Also the funds to follow one’s heart??? :+1::+1::+1:

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I think I’m going about this all wrong. Instead of an adapter for clamp on handguards, this should be made to accept standard barrel nuts. More beneficial to everyone and definitely easier to achieve.

The end result was always to made of aluminium, adding threads makes it a requirement. I would be willing to spend a little more time on this project and then pass on the STL to someone with the equipment to replicate it.

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@ValorSolo

Just my humble opinion, I think you should follow your ‘original’ design and not for ease sake… If you enjoy the challenge then nothing is more satisfying than personal achievement? The end result is that you will ‘own’ an idea that is YOURS, my friend. Don’t be robbed by what others may think! There is a vast crowd with so many opinions? That is why I pursue my own builds with my firearms. There are too many aftermarket companies with too many ‘toys’ to choose from and all of them are in competition for your business! Stay true to yourself and best wishes in all your endeavors… I am looking forward to ‘seeing’ your end results!!!

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I’m abandoning my other idea for one I think will be better. The shorter one I was working on could still be a viable project on down the road. But it needs to be all metal. This new one will be a 3 piece adapter for 7-10" quad rails or handguards. A metal plate that’s mounted with the barrel nut. A PLA mid section, roughly 4-5 inches. And finally a metal plate with AR barrel nut threads on it. I have the mid section drawn up, just need to work on the metal bits.

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@ValorSolo

Charles, I am honored that you notified me about your project. I truly want to encourage those that think ‘outside the box,’ and not get discouraged by what others think and feel. It is that negativity that stifles greatness! You cannot imagine ‘my’ table full of uncompleted projects waiting to find a HOME!!! Big smiles. Keep at it… I am looking forward to ‘seeing’ a completed project. Don’t bother leaving your ‘starting block’ hard… You are already a winner! Blessings, my friend.

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What’s the best choice for a aftermarket forend ?

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AzTac, inc. used to make a forend as well. i found theirs ugly as hell but you might check with them and see if they still make forends for the gen 2’s

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best one ive found is the indexable Red Lion for the Sub 2000 Gen 1 and 2

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ya agreed. if i had the cash i would buy a gen 2 for the barrel and an RLP rail. for some reason i just don’t like the kel-tec gen 2 forend. i would mod my gen 1 forend and put it on a gen 2 before i would leave their ugly forend on there. and all of this is in the world of aesthetics only lol. i have no idea who they have over their making their aesthetic decisions but they need a new hire. functionality overall seems well on most of their stuff, not a lot of bells and whistles but good foundations. but for gods sake they make some of the ugliest firearms around. i hear good and bad things now and then for their whole lines but on the performance of the sub2k i would take either or both as i’ve never had a problem with either gen over the years. and i know if their is an issue they take care of it quick and easy, have never heard better things on their customer service. especially since they still allow the gen 1 to gen 2 upgrade for the cheap even after all these years and will even upgrade it to nickel boron for a very small fee too.

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@nic, keep a eye on gunbroker, been seeing a few GEN1 Sub2000 forends on there used, going for around 1/2 prices. Im going to eventually put one on my GEN2 as well. its just a rock solid rail system. but im putting the fold down RLP sight on the G2 . they wasnt out yet when i put the standard RLP sight and muzzlebrake on the G1


right on! thx a lot, nice looking piece btw.

  • Nic
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oh didn’t hit me a moment ago, but i do have two of the original kel tec cnc forend’s that had installed the fold to the side common 1" ring scope mount. SUB-312 back in like 2005 when they still sold it. no clue why they stopped making that or even going down that path updating them for red dots… one is still mounted on one of .40 gen1’s now and i still love it. (took me quite awhile (years) to find the second one still in package unused) i’m just trying to jump on the red dot band wagon and give it a wirl with the my other gen 1 .40 and the RLP forend.

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So…first of all, the 420 is shorter than the stock gen2 forend.

Second. Even after I rocksette every screw and contact on the damn thing, it came loose after 30ish rounds, every time. I suspect it’s a poor design in terms of locking screw liength and the barrel clamps I think don’t stand up to the heating cooling cycle.

Or maybe I just got a bad product. But I sent mine back for a refund and put the original back on. Sanded down the bump for my red Dot and all is right in the world again.

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Is there a specific program you use?

@hgnesmith If you are asking about the graphic manipulations, I generally use just the free Paint.Net.

If I need a feature it lacks, I will use an ancient Version 8 of Paint Shop Pro.

I get lost with any more bells and whistles than those provide. :grinning:

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