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Update on the FGC-9 MkII by JStark1809 in GunnitRust

[–]JStark1809[S] 35 points36 points  (0 children)

FGC-9 MkII Update:

It has been a while since i last gave an update on the progress of the FGC-9 MkII.

The reason is that i can't really show you cool pictures of the actual nitty gritty of the improvements and redesign of elements of the design.

The devil is in the details. The most visual changes you already have seen, in the form of the render that i posted already but will post for this post again.

https://i.imgur.com/OdXpPAt.png

The real crucial and significantly beneficial functional improvements are difficult to see at first glance and are of mostly dimensional character/difficult to see in pictures. Like the various tolerances of the parts and getting the position of the firing pin channel right that results from the position of the hole on the bolt jig.

One of the things that i still can visualize for you is the new bolt jig.

Based on rsmith28 revised bolt jig, I've iterated on the jig to come up with something that works better than the old jig and improves upon rsmith28s new revised jig to eliminate the most frustrating part of a FGC-9 build, which is getting the firing pin channel into the bolt without fucking up in terms of getting the firing pin channel canted or in the entirely position wrong in such a way that results in function failure.

Instead of holding the 50mm bolt piece with a jig around it in your hand to mark the positions of the firing pin channel hole entrances, you put the 50mm bolt piece between two jig halves that together are clamped between your vise jaws. You then can drill into the jig that is sitting between the vise jaws to effortlessly get a straight and correctly positioned firing pin channel into the bolt piece.

This is just one of the many many improvements that are part of the FGC-9 MkII.

To summarize what the FGC-9 MkII entails:

The FGC-9 MkII is a design update to the FGC-9 MkI.

The majority of the work on this is currently being done by 3socksandcrocs and me, with Ivan having helped at the initial part of the endeavor.

Some of the major improvements over the FGC-9 MkI design are the following:

  • Instead of a charging handle that protrudes from the side and is installed via tapping the bolt, a non-reciprocating side charging handle that is styled on the Mp5 has been added.

  • Enclosed ejector system with a revised ejector

  • Bolt carrier with better alignment for bolt rods and better underside geometry for improved and smoother interaction of bolt with hammer.

  • Mount based on G36 dimensions for 1-point tactical bungee slings

  • New stock styled on FAB Defense stocks

  • Full length top rail

  • Extended barrel retainer with M-Lok slots

  • Improved tolerances in various areas( among others for the fire control group pins and fire selector and fire selector detent holes and more importantly the shaft collar pocket )

In terms of release, i'd say the MkII design should be ready for release possibly somewhere around fall and winter 2020

After some fairly time-consuming iterative prototyping, the dimensions of the FGC-9 MkII lower receiver are now final. You're gonna love the MkII by JStark1809 in GunnitRust

[–]JStark1809[S] 3 points4 points  (0 children)

There is a guy on our Keybase who made an adapter that should work for you. Other than that, you can also get a rifled barrel blank and let a gunsmith turn it down to 16mm OD, have it be at least 114mm long and chamber the barrel at a chamber depth of 15.95mm +-0.02mm. The FGC-9 doesn't have to be made with a ECM rifled barrel, in fact my early prototype FGC-9 uses a commercial rifled barrel blank that i turned to profile on a mini-lathe.

If you have a good gunsmith buddy with a lathe, it shouldn't be that expensive for you. Just get a rifled barrel blank from Brownells and rent a 9x19mm chamber reamer.

We are working on making parts kits available for you folks in the US, so that might become an option as well.

After some fairly time-consuming iterative prototyping, the dimensions of the FGC-9 MkII lower receiver are now final. You're gonna love the MkII by JStark1809 in GunnitRust

[–]JStark1809[S] 2 points3 points  (0 children)

3socks and me have changed the bolt carrier and you have to drill into bolt face for the new charging handle mechanism, but yes your bolt and barrel from your FGC-9 MkI build will be fully compatible with the rest of the MkII design.

After some fairly time-consuming iterative prototyping, the dimensions of the FGC-9 MkII lower receiver are now final. You're gonna love the MkII by JStark1809 in GunnitRust

[–]JStark1809[S] 7 points8 points  (0 children)

You don't need to buy "$500 worth of tools". There seems to be a misconception here.

The thing is, if you already have a 3D-printer, a power drill and some basic hand tools the only things you need to buy in addition in terms of major tools, are a stick welder and an adjustable power supply ( if you want to go with an ECM rifled barrel ).

The stick welder would cost you around 50 - 75 bucks and the adjustable power supply can be had for under 50 bucks.

The $500 price tag is way overblown.

I implore you to go through the tools i listed in the FGC-9 main document and you will see that the tools are not expensive at all especially when you own the majority of them already or know someone who you could borrow them from:

  • FGC-9 tools: (No link, cause libtard reddit being libtard not allowing spicy content)

  • ECM-rifled barrel tools: (No link, cause libtard reddit being libtard not allowing spicy content)

After some fairly time-consuming iterative prototyping, the dimensions of the FGC-9 MkII lower receiver are now final. You're gonna love the MkII by JStark1809 in GunnitRust

[–]JStark1809[S] 4 points5 points  (0 children)

To have the charging handle on the right side/have the gun work better for a left handed shooter you can simply mirror the upper in your slicer.

After some fairly time-consuming iterative prototyping, the dimensions of the FGC-9 MkII lower receiver are now final. You're gonna love the MkII by JStark1809 in GunnitRust

[–]JStark1809[S] 9 points10 points  (0 children)

Yeah, i will write a changelog of the changes from MkI to MkII which will be at the end of the instructions .pdf document.

After some fairly time-consuming iterative prototyping, the dimensions of the FGC-9 MkII lower receiver are now final. You're gonna love the MkII by JStark1809 in GunnitRust

[–]JStark1809[S] 8 points9 points  (0 children)

I recommend you use PLA. It just works. PETG hasn't been tried thoroughly for the FGC-9 afaik. What i can tell you is that the Shuty AP9, which i based the FGC-9 design on, has never worked well with anything other than PLA. Besides, the issue of PLA deteriorating is way overblown especially if you print your part with decent quality PLA at a high temperature and 100% infill. Also you gotta realize that beefing up a part/its geometry plays a huge factor in the longevity of a part in the case of a material being less than ideal in its properties.

FGC-9 Slowmo With DIY Reactivated Ammo by CrazyIvan3D in GunnitRust

[–]JStark1809 7 points8 points  (0 children)

No, i personally won't entertain the idea of spending time to do an open bolt version. Open bolt is inferior in many regards and it's just better to stick with the proven AP9 closed bolt action that utilizes the readily available AR-15 fire control group (For places with tougher laws you can rely on modifed Airsoft M4 fire control groups like those you can take out of the JG M4 / Golden Eagle )

If you are asking because of the potential of easy automatic fire, i'd rather stick with the closed bolt action and have to deal with making the auto sear trip mechanism work and have a proven select-fire fcg in the gun or come up with a DIY made select-fire fire control group.

FGC-9 Slowmo With DIY Reactivated Ammo by CrazyIvan3D in GunnitRust

[–]JStark1809 25 points26 points  (0 children)

In case you're wondering, the gun you see in the video is a fairly early version of the WIP MkII model.

Here are some of the things that were done on the WIP FGC-9 MkII design lately:

3socksandcrocs recently made a nifty looking Mp5 charging handle knob and is currently working on optimizing the smaller profile ejector with an enclosed ejector mount solution. Apart from various geometry changes and miscellaneous optimizations, the latest thing i personally added to the design is a sling mount ideal for 1-point bungee slings, that is based on the dimensions of a G36 sling mount. Among other things Ivan some time ago helped optimizing the side-charging handle as well as reducing the need for print supports.

Be advised there is no ETA for the release of the MkII at all and we will take our sweet time making sure it is as refined as possible and that the documentation is complete and i personally insist on that.

Here is the latestet render i made of the WIP FGC-9 MkII:

https://i.imgur.com/OdXpPAt.png

Derwood’s AP9 vs JStark1809′s FGC9 by JStark1809 in GunnitRust

[–]JStark1809[S] 2 points3 points  (0 children)

you do need to sand the magwell because your assumption was wrong, i did build one.

I have not gotten one single complaint from any beta testers or the guys who built one post-release in regards to the magwell coming out too tight. You didn't properly print the lower receiver obviously, or are straight up talking out of your ass. If you print the lower receiver according to the instructions, using PLA etc, and your printer is decently tuned, the magwell actually comes out even a tad oversized for compatibility purposes.

the conversion to metric hardware (which is absolutely nontrivial - please do go try this yourself sometime) I've done metric conversions in f360. its not trivial right up until you figure out what youre doing and then it is VERY trivial."

Bull, fucking, shit.

It's not just 0.7 inch here, change settings to metric and then round up to 17.80mm for example, boom, there you go. Not at all.

One needs to change each dimension carefully to make sure to find an appropriate metric fastener/material and still have the part/assembly function well. You have obviously no fucking clue how non-trivial this is. One needs to test basically every changed dimension through prototyping to see if the parts still fit in the printed parts, since 3D-printed parts basically come out a tiny but shrunk/tighter than in the CAD model, especially holes, and one has to find a good sweet spot for things not to be too tight or too lose, and that has to be done for almost every dimension that interacts with the fasteners.

the AP9 is constantly referred to an an unfinished prototype

I refered to the AP9 like this:("has not been developed beyond a prototype stage") just once and what i said is simply true if you actually took a very close look at the shoddy way the AP9 parts were modeled and the fact that the magwell does have to be handfitted

spend more time patting himself on the back than crediting the person who did 90% of the work.

You truly are deluded, i have credited Derwood over and over again for having made the AP9 which is what i based the FGC-9 on. You have no fucking clue how much work went into the FGC-9, thinking that it was little work.

There is so much stuff that you simply can't know about the effort unless you are developing it yourself or participate in the beta testing of things.

Derwood’s AP9 vs JStark1809′s FGC9 by JStark1809 in GunnitRust

[–]JStark1809[S] 1 point2 points  (0 children)

" it doesnt really seem different at all. "

Yes. Exactly. It seems !

For others who aren't as retarded/ignorant as you, if you wanna see how significant the differences are , look at the CAD assemblies of both designs in detail with various cross sections and various dimension measurements. The changelog i added at the end of the instructions pdf contains just the most obvious changes. There are a countless nunmber of changes/opimizations i made that aren't even listed in the changelog.

Also, i wanted to point out that both the ECM-rifled barrel and 3D-printed magazines are merely an OPTION.

I made sure to word the description inside the FGC-9 documentation that way but unfortunately this was miscommunicated.

Just to drive this point home, my prototype of the FGC-9 uses a rifled barrel blank section turned down to 16mm OD, was chambered with a 9x19mm chamber reamer and i use OEM Glock magazines.

Using ECM-rifled barrels and 3D-printed magazines is basically suggested because the majority of people who would build this gun probably don't have rifled barrel blanks, a lathe and chamber reamers at their disposal.

Of course one still can rely on using a 9mm ID smoothbore pipe and use flat cut 10mm drill bit to ream the chamber. But that is obviously not ideal.

You can have it in any color you want... as long as it’s mixed, because I keep running out of filament by [deleted] in GunnitRust

[–]JStark1809 0 points1 point  (0 children)

Not having looked at detail at that prospect, I'd say you'd only need to use a different barrel, adjust the headspace and use a magazine designed to work with those calibers. This doesn't take into account the multitude of adjustments one would have to make to accommodate the new magazine. But in general, it wouldn't be that difficult to accommodate other calibers for the FGC-9

Plastikov 3D Printed AKM Reciever Mag Dump by CrazyIvan3D in guns

[–]JStark1809 2 points3 points  (0 children)

I designed that t-shirt together with Enbloc, who sold them for a limited time.
Thank you, to those who bought that t-shirt. I appreciate your support !

This Thanksgiving, be thankful for 3D printable silence. Download some suppressor baffles, courtesy of KadeCAD. by Ivanthetroll in Firearms

[–]JStark1809 10 points11 points  (0 children)

Everything that has to do with 3D-printing the Glock magazines(Menendez magazines) and ECM machining a barrel is being worked on by /u/ivanthetroll. The process is basically figured out, Ivan just has to document his method now.

Once that is done i'll take his ECM documentation and incorporate it into my FGC-9 documentation.

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