Looks great! 300BLK is definitely a caliber that can be reloaded a lot cheaper than buying factory ammo, especially subs.
It's in the build tutorial. Do you want a Carbine or Rifle buffer tube? Does your upper have a Forward Assist? Will you use anti-walk pins for your FCG? The UBAR-X has an integrated grip and the regular allows you to add your own grip.
Thank you for following up about this!
The bolt has to weigh a lot more for those other calibers in a direct blowback firearm. In 9mm the bolt weighs about 1.7lbs. For 45acp and 10mm the bolt would need to be 2.3 and 2.8lbs respectively. It can be done but would require a lot of work to change calibers.
Edit: Source: https://10mmautocombat.wordpress.com/blowback-bolt-calculations/
For full transparency, here is the comment in question that got me banned.
Someone posted about how their account got nuked. I recommended they come here instead and the subreddit mods banned my account. I guess they would rather hold onto their shrinking fiefdom than actually advertise this community.
EDIT: Reddit username is same as here, ClemensXIV
UPDATE: Mods confirmed they will ban you if you so much as mention the Guncad Index Forum. Good luck out there.
There are some frames but I don't think a PDW style chassis has been released yet. I think Chairmanwon was working on a homemade FCU using a SCS flat and bending it with printed bending jigs. If he gets that to work then I see a lot of future development with the RXM.
Check out the Everything Black Powder youtube channel. He makes his own black powder and tries a bunch of different ratios and components. He uses different carbon sources. He also tries ammonium nitrate and sodium nitrate instead of the usual potassium nitrate. Potassium nitrate is the safest and easiest to use. The other two are much more hydrophilic which can ruin the powder, in addition to being much more hazardous to have around. https://www.youtube.com/@Everythingblackpowder
Yeah, I'm sure if the receiver was printed it would cut the noise down quite a lot.
FTN4 is the best printed suppressor out there. There are options for 22lr, 556, 308, 9mm, and 45. They need reinforcement, either an aluminum tube or a carbon fiber sleeve. With suppressors tax dropping next year, someone may come up with a better design eventually. However, the FTN series of suppressors is quite robust and can handle FA rates of fire, especially when it's made of PA6-CF or even better, PPA-CF.
How much of the noise is from port pop and muzzle blast versus the action sounds? The bolt slamming home on my 10/22 is obnoxiously loud and I wear earplugs even while shooting that suppressed. I tend to prefer shooting repeater and single shot firearms suppressed. Don't get me wrong, I'll suppress every firearm I can, but repeaters are a lot quieter than self loaders.
If you're on desktop and want it to look more like Reddit, change the view to Cozy.