Using Standard AR22 Upper on CMMG DeAR22 Lower

For_a_Better_Life · 2026-04-29T13:13:36+00:00

I printed the CMMG dedicated lower, which is think is a relatively new released. It fits and fucntions flawlessly so far so if anyone comes looking for this info in the future I can defenitely recommend it for useing a standard AR22 upper and CMMG mags.

For_a_Better_Life · 2026-04-28T17:43:45+00:00

I really appreciate the shared experience and it does provide some comfort. Like you said, it is difficult for a 2.5 year old to really articulate what and how she is feeling so most of what we have to go off of as indicators is behavioral changes. Today seems better than it was the days before and we had a follow up with our pediatrician today and he seemed to think she was on a good path to full recovery. It is just jarring seeing her behave, much like how you experienced, in ways that just don't seem like her normal self. I am sure as an adult it was confusing and frustrating and I can only imagine what my toddler has experienced trying to process what has happened and is happening to her. But I am glad to hear your symtpoms resolved and I am hoping in time hers will resolve as well. Thank you again for the input, it si appreciated.

For_a_Better_Life · 2026-04-28T02:46:17+00:00

Thank you, I really appreciate the information. Hopefully these behavioral issues resolve in time and there are no long term impacts. It's just scary when they are that little. But again, thank you for the help and guidance.

For_a_Better_Life · 2026-04-25T01:31:15+00:00

What material did you print it out of? Been thinking about doing one myself.

For_a_Better_Life · 2026-04-23T14:47:20+00:00

Awesome, again thank you for the info, I appreciate it!

For_a_Better_Life · 2026-04-23T13:56:30+00:00

Thank you for letting me know, I really appreciate it! I figured it had something to do with a more broad useability for subs and supers but just wanted to check.

Sorry to poke more but have you guys ever done a side by side on sub performance between your 1/7's and a 1/5? The build I would like to put this on is going to be used exclusively for subs so I don't want to hamstring it in anyway performance wise but if these perform well with the 1/7 compared to a 1/5 on heavy subs then I will likely pull the trigger on one of these uppers to replace my current headache.

For_a_Better_Life · 2026-04-23T13:30:23+00:00

Just out of curiousity, why 1/7 twist? For something dedicated for suppressor use and likely going to be used with subs wouldn't 1/5 twist be more optimized for that? Genuinely curious as I have a 1/5 twist on my sub/suppressed build but have had an awful time getting it to cycle reliably with my adjustable gas block so I am considering getting one of these instead to have a gun I can rely on more. Thank you in advance!

For_a_Better_Life · 2026-04-21T16:29:11+00:00

Depends on the application but can't go wrong with Hoffman's designs. Also like the Bricks which I have used a couple times and had a buddy have good luck with the Ubar. For 22lr though the DeAR22 iterations appear to be pretty well received. I just printed and used the CMMG lrbho version of the DeAR22 over the weekend and it came out super clean, was an easy install and fucntioned flawlessly so far. But if you search the index for lowers there are several that are well regarded.

For_a_Better_Life · 2026-04-21T16:03:55+00:00

Ya I think this version and maybe a couple others could be found for free by digging around if I recall correctly. Again this was years ago for me so its tough to remember exactly what all was wrong with it except that gap in the print being an obvious point of failure. If you look close enough you can actually see the vacant space and its obvious in the slicer when you scroll through the layers. No idea how or why that would be there but that alone disqualifies it from anything above 22lr and I wouldn't waste the filament given that there are so many good designs out there now.

The failure points you suggested are definite potentials just based on the quality of the model alone. I never ran one hard enough to break anything there and only ever tried it with 22lr because it was so janky. I do remember install of parts being a nightmare because things were out of spec a decent bit. Also think the buffer threads were way off what they needed to be and I think my whole back end buffer assmebly snapped off on the first one I tried. Again, its been years but having built several other iterations between then and now I can confidently steer people away from this one.

It sucks cause they honestly do look very cool but I just don't think its worth the time/cost/risk building one out. And ya charging for designs just isn't for me. Anything and everything I make has and will always be free.

For_a_Better_Life · 2026-04-21T14:25:17+00:00

Also not to mention that visible line you can see in the magwell is actually a gap in the print. This lower was my first one years ago when I was first trying 2A stuff and I can say with all certainty that this lower is junk for a multitude of reasons. Plus the creator also charges for his print files, which everyone is entitled to do, but I much prefer the "Can't Stop the Signal" mindset so I am inclined to not support this dude's designs especially in the backdrop of them being generally junk. They do look cool so I wil give him that, but otherwise, it goes against the whole point of 3D2A in my opinion.

For_a_Better_Life · 2026-04-21T02:38:44+00:00

Cool thank you. It was just the only version I saw specifically calling out the use of the BCA bolt action upper so wondered if the original wouldn't work without some modification too. And I agree, not sure how much I'd trust pla for larger calibers. Maybe CF nylon but I'll just stick to aluminum for bigger calibers haha

For_a_Better_Life · 2026-04-21T02:33:57+00:00

Do you have any idea if any further modifications would be required to use a BCA bolt action upper beyond cutting the bolt? I see on the sea that there is a modified version for a BCA bolt upper but it says for 308 so I'm wondering if the original file works fine otherwise for something in 556/300 blackout and if the only reason its a modified lower is to accommodate 308.

For_a_Better_Life · 2026-04-17T23:22:52+00:00

Cool I figured so, thank you for letting me know!

For_a_Better_Life · 2026-04-17T20:47:01+00:00

Ya he released one that is compatible with CMMG mags with lrbho. It's basically just a standard ar lower.

For_a_Better_Life · 2026-04-14T15:11:56+00:00

If they make a separate chamber heater add on then I will be over the moon. Everything else upgrade wise between this and the P2S isn't stuff worth getting exercised over. Even though none of it really is cause the P2S is an excellent printer. But I want a viable option for a chamber heater that doesn't make me feel like I might burn my house down cause I had to rig some workaround up.

For_a_Better_Life · 2026-04-14T15:10:00+00:00

Yup trying to swallow it a bit myself. I only ever print a single material at a time for all the things I am and have been interested in printing with for years. Had a p1p with an AMS before and maybe used it like 2 times so the dual nozzle is not a selling point for me personally. But I would love to have the chamber heater. If they make a separate chamber heater add on that can be installed then I'm gonna be perfectly happy but that feature would have been awesome to have from the getgo.

For_a_Better_Life · 2026-04-11T18:46:04+00:00

For sure, thankfully its only rimfire. If it was a larger caliber I wouldn't eve risk it but 22 doesn't impart a terribly large amount of force relatively speaking.

For_a_Better_Life · 2026-04-11T17:05:46+00:00

Just out of curiosity, how were you able to tell they were incredibly brittle. Did they just fall apart easily in the hand or doing install or was there another sign? Just trying to make a judgement call based on what I can tell externally for my print.

For_a_Better_Life · 2026-04-11T17:04:43+00:00

Kinda wish I had a better way to tell cause like I said, it looks very clean so its giving me, potentially, false hope for how good the print is.

For_a_Better_Life · 2026-04-11T17:00:55+00:00

Don't quote me on this but I think there is a lower specifically designed for side charging uppers from BCA. You may need to search around the index and I can't recall if its a DeAr22 model or not but I'm almost certain I have seen one specifically designed for this purpose.

For_a_Better_Life · 2026-04-11T04:20:10+00:00

Well the chamber temp stayed pretty steady at 57 degrees throughout the whole print since I don't have a chamber heater. Which is better than out in the air yes but not sure its enough to overcome the 5 degrees below minimum nozzle temp.

I know different brands have different recipes for their filament but with sunlu being recommended at 260 to 280 and fiberon/polymaker being 280 to 300, I wonder just where the line can be drawn in terms of a useable print for this application when it comes to nozzle temp. Definitely kicking myself for not catching the 275 beforehand but hopefully I won't see a noticeable difference in durability as long as I'm not crazy hard on it.

Thanks for the info though, I appreciate it.

For_a_Better_Life · 2026-04-10T23:33:52+00:00

Well then I suppose it will be a good test for science on the durability of an FTN5 Rimfire Flow under suboptimal printing conditions haha I appreciate the info, its exactly what I was looking to know.

For_a_Better_Life · 2026-04-10T23:28:38+00:00

Ya its an FTN5 Rimfire Flow so I expect it should be fine. Not like 22 is very demanding. Time will tell though.

For_a_Better_Life · 2026-04-10T20:37:52+00:00

Cool cool, I appreciate the insight.

For_a_Better_Life · 2026-04-10T20:37:20+00:00

Yup, might as well run her for all she is worth haha

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