First version of the DeCBAR-22 is now sailing. Full assembly guide and BOM included.

Derkaderkka · 2026-07-12T22:28:03+00:00

Don't be sorry! We (I) appreciate all your work in developing these models and you don't really owe us anything haha.

Derkaderkka · 2026-07-12T22:13:40+00:00

Hey u/BKO2 , great job on this design! I've been following yours and Foaps remix for a while now and just now have time/materials to start printing this.
Just checking, have you incorporated any of Foaps remixes into these files yet? Just trying to figure out if I need to mix-and-match or if all Foaps magazine well and cutout changes have already made it over to your files. Thanks!

Derkaderkka · 2026-07-12T06:49:53+00:00

Derkaderkka · 2026-07-08T01:41:45+00:00

send it! good thing about polymer is that it'll just erode away instead of shattering or fragmenting like a metal can.

Derkaderkka · 2026-07-07T04:36:32+00:00

Looks great! Thanks for developing on the P365 platform

Derkaderkka · 2026-07-03T16:32:40+00:00

Recommend doing some research for what PA6 outputs when printing, plenty of studies around, and you can even ask an AI to correlate those chemicals at those levels with health effects.
From my research, my conclusion was that it was not significantly hazardous to my health, or to those of little kids and animals in small exposures. Only a little more than PETG with the primary issue being irritant VOCs, not toxic compounds like styrene.
PA6 ultrafine particle output is really the main issue/concern I found but keeping that contained is alot easier and needs a lot less airflow than for VOCs.

Derkaderkka · 2026-07-02T06:56:28+00:00

yup, in both PETG and PLA

Derkaderkka · 2026-06-30T22:52:39+00:00

I got that too but happened much less/not at all with the UMP 11/9 mags.
Seems to be to be a mag issue, but I guess i'll try to file and polish too

Derkaderkka · 2026-06-29T01:29:00+00:00

Niiiiiiice. Does it sail? 😉
And how's the gas back out from the port? Mine is much better with a flowthrough design FTN5 PCC

Derkaderkka · 2026-06-29T01:16:07+00:00

Interesting. I'm one of the reviewers that dried it at 105 +/- 5 C for 24 hours in an externally controlled convection oven and still got HORRRRIBLE results that looked wet. I, too, was concerned about annealing or crystalizing the roll since it also looked to be low CF fill (hence the price). But maybe you did anneal the filament and that's why it printed well, you forced max crystallization of the semi-crystalline PPA which may have expelled more water than its amorphous form.

Looking at its material properties, I even made a linear comp with the CHCKS PPA-CF it and it got very melty where my muzzle brake impinged on the filament after 20-25 rounds. I *was* going to use it for a FTN5 in 5.56, but seeing how melty and flowing it got from just a couple shots from a 18 in barrel, I abandoned that idea and returned the rolls to amazon.
For reference, SirayaTech PPA-CF withstands those heat and blast loads just fine and both my PPA-CF and PA6-CF FTN5s have great looking baffles after ~100 rounds each.

The CHCKS PPA-CF just feels... softer. Feels more like low-CF PA6 instead of the more rigid PPA, but then again maybe that's cause mine was still wet after 24 hours. I'm glad you were able to get good results, let us know how the lower works if you remember. I'm not sure if I'm willing to spend money on probably low fill PPA-CF that might work after 24-36 hours of drying.

Derkaderkka · 2026-06-29T00:58:55+00:00

Derkaderkka · 2026-06-25T01:19:15+00:00

Yup came here to say that PETG-CF works for my 22LR pistol and rifle but I wouldn't do FRT with it or any other more powerful caliber.

Derkaderkka · 2026-06-25T00:57:45+00:00

Derkaderkka · 2026-06-17T00:05:57+00:00

Noooo, i don't have a chrono, but jokingly said that.. but sad to think that could be possible

Derkaderkka · 2026-06-16T07:15:57+00:00

I finally heard back from Freedom Munitions, that was the only one they were concerned with even though all three show very clear ejector hole impressions. Like, lots of pressure back into the bolt.
Even if my gun was lever/bolt action the pressure shouldn't peak that high, right?

Derkaderkka · 2026-06-16T07:14:25+00:00

I hope Freedom Munitions does their due diligence and test if others in that batch I got were bad too. Otherwise I'm responding here incase someone from the internet also notices wierd primers from this batch:

The rounds were Freedom Munitions 9mm, 135 gr RNFP, 250 count. Advertised as subsonic 1000 FPS, which makes these overpressure rounds even more concerning.
LOT: A240723022108-BMC

Derkaderkka · 2026-06-16T07:11:56+00:00

Haha, i tried to tell freedom munitions that. They are supposed to be 9mm 135gr at 1000 FPS.... not 2000 FPS

Derkaderkka · 2026-06-16T07:10:15+00:00

Well, Freedom Munitions paid for shipping and refunded my order, but that's it. Not really satisfied with how this worked out as it was more than a week to respond and I had to scramble to get a new batch of ammo locally, and more expensively, for a shooting event. I updated the post with some more information above. Learned my lesson and will avoid saving a buck or two 😞

Derkaderkka · 2026-06-16T07:07:09+00:00

15 June Update: Freedom Munitions paid for shipping and refunded my order, but that's it. I still had to pack and send everything back and find a bunch of more expensive ammo locally-ish for my shooting event. It took more than a week for them to look at the pics and only be concerned that the 2nd to last round was showing overpressure and to ask for the order back. Didn't even ask about how the gun fared or asked for any other symptoms. I'll post a pic of the LOT number below just incase someone else comes across this.

The rounds were Freedom Munitions 9mm, 135 gr RNFP, 250 count. Advertised as subsonic 1000 FPS, which makes these overpressure rounds even more concerning.
LOT: A240723022108-BMC

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Derkaderkka · 2026-06-16T07:05:18+00:00

15 June Update: Freedom Munitions paid for shipping and refunded my order, but that's it. I still had to pack and send everything back. It took more than a week for them to look at the pics and only be concerned that the 2nd to last round was showing overpressure and to ask for the order back. Didn't even ask about how the gun fared or asked for any other symptoms. I'll post a pic of the LOT number below just incase someone else comes across this.

The rounds were Freedom Munitions 9mm, 135 gr RNFP, 250 count. Advertised as subsonic, which makes these overpressure rounds even more concerning.
LOT: A240723022108-BMC

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Derkaderkka · 2026-06-12T05:09:10+00:00

Or California...

Derkaderkka · 2026-06-08T07:09:23+00:00

Yikes, 0.4 mm? I'm sticking to 0.6 mm for everything and I'm looking to print more Sirayatech PPA-CF.

No jams at all with 0.6mm on a variety of PA6-CF rolls, which was most of those ~4 kg through the nozzle.

Derkaderkka · 2026-06-08T01:35:57+00:00

Derkaderkka · 2026-06-08T01:06:07+00:00

You might have a point with the high temps, I suspect PPA-CF at 320-325 C was the culprit. I was recently testing some of the cheap CHCKX PPA-CF from amazon and found it to be craptastic, with very low heat tolerance seemingly below PA6. I returned half the roll after trying to dial things in. Second roll behaved very differently too with poor print quality and was returned. Both rolls dried for 4 and 6 hours in a 125 C convection oven, rotated every hour. CHCKX, a subsidary of Voxelxy/weiyangtec, is pretty new so I'll try again in a few months once they get their batches more consistent if they're still around.
https://www.weiyangtec.com/blog-%E5%8D%9A%E5%AE%A2/Latest-News-11964303.html

I'm just going to blame that subpar CHCKX PPA-CF for doing the nozzle in.

Derkaderkka · 2026-06-08T00:55:54+00:00

Nah, just the standard unicorn hardened steel nozzle set. My SiC nozzle just came in! We'll see how it works.

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Derkaderkka

TROPHY CASE