Flypetheus

Totally, that's a fair point. Out of darts is a great choice and they probably have a slightly better selection of upgrades as they're a general nerf hobby shop rather than more specifically a blaster shop.

There are gonna be 2 options when it comes to high quality prints. Out of darts or silverfox industries. Both are pacific northwest based, both have fantastic customer service and both have awesome print quality. Both also have a great selection of colors, although technically silverfox has a few more options.

As far as upgrades go, I do generally recommend the aluminum "vanguard" ramrod and even injection molded rambase, plunger and sear upgrades. I believe out of darts and possibly silverfox both sell those upgrades, although I'm not certain of their compatibility with the caliburn 4 specifically. If I'm not mistaken the ones offered by are made of either acetal or delrin. Generally going to give you a better seal due to high quality tolerances, and last longer as they're more durable than their 3d printed counterparts.

As far as barrel upgrades go, I recommend getting a 13mm ID barrel. I'm not 100% sure of the optimal length for a caliburn barrel, but with my 40cm long 13mm ID barrel paired with a k25 caliburn length spring I generally get in the 210-230 fps range, with a very manageable prime. I believe out of darts has the 13mm ID barrels on their website organized by what blaster it's recommended to be paired with.

As far as a foregrip goes, not that you asked, It's mostly a preference thing, although some folks find priming with an angled grip easier on the arm because of the muscle group it engages, while some folks find a vertical grip is more comfortable. It may wear on your elbow more than an angled grip, however. I personally recommend a k25 spring as long as you're not trying to break 250 fps, as I find any heavier spring is generally uncomfortable to prime. Lot's of folks may go with a k26 and while it's manageable I don't feel the additional weight justifies the FPS gain.

As far as a scar or bcar goes, I believe you can choose to include one of Sillybutts' printed spigot scars with both silverfox and OOD, which offers printed rifling(which has decent accuracy but tends to affect FPS more drastically) and the ability to shoot mega XL darts by fitting them over the end of the pcar. Beyond that, I'm not terribly familiar with the popular BCAR or SCAR options out there as I generally use a printed version by old fusion designs that's very easy to string yourself, and my only experience with BCARs is an integrated one on my lynx blaster, so hopefully another commenter can offer their advice if you're looking to get the best of the best. Hopefully that answers most of your questions!

Absolutely, I totally agree with you. Just being pedantic about the details.

While I do totally agree that a community based design with a hardware list and printable files will outlast a niche one off product from a smaller toy manufacturer than nerf, I think it's slightly unfair to compare the max outlaw and the farshot. Boomco was a new ammo type made by only one company and obviously just stopped existing once boomco stopped producing their ammo. Maybe there was 3rd part boomco I didn't know about though. Also though, there are still websites offering rainbow pistol hardware kits in the US as far as I'm aware where there is no one who sells YEHW hardware kits. Now, it's not exactly DIFFICULT to source the hardware, but even people who print their own blasters don't necessarily want to do that.

Well the yehw is effectively dead, so unless you're sourcing your own hardware (something you're probably not that likely to do if you were considering buying a stock blaster) you're not gonna find an outlaw alternative imo. Plus, the yehw isn't even "pro" level performance. Barely even elite standard with the heavy spring. The outlaw is about to be the only widely available over 100fps short dart exclusive hammer prime revolver pistol, even if it barely works on launch it will be a success imo. And not like, figuratively a success, I just mean financially.

You're not wrong, the prime is uncomfortable and it has really bad seal issues or...something, lol. At this point you can't really source the hardware anymore I don't think.