For anything that’s not 22 and doesn’t have the Browning tilting barrel design the I agree that ftn4 is your best choice in terms of effort vs effect.

For pistols with the tilt barrel (you’ll have to ignore my ignorance of nomenclature) the kneelsun v2 by pembletonandsons(?) that mounts via the booster from their site. it works so well I accidentally v left out the aluminum sleeve and send cut send plates and despite all the extra friction from looser tolerances and steel with rough edges on plastic it’d still reliably cycle with supersonic ammo and occasionally with subsonic ammo.

For .22 there’s several good options requiring no reinforcement or post processing. The pill popper by plaboi is a good option with a small and medium profile. With a ten inch barrel and federal subsonic ball ammo it sounds like a pellet gun until the bullet hits something solid or a spent shell makes the tell tale jingle. Almost movie quiet.

Idk for sure with mpa but I bought a MAF upper and bolt and a year later aves had a sale on their mac bolt so I bought one of theirs. the MAF upper works fine with both of them. I would assume the same is true for all of them but I wouldn’t put it past any company to make their shit proprietary if they knew they could.

You mind showing me how they look in a dm? I’ve never rebuilt a partskit by traditional methods because the ppsh and cetme kits I’ve personally held had that bubbly jagged look of an ugly plasma torch cut

YES! I’ve been wondering why nobodies tried that given how cheap the kits are. I’ll be happy to be a beta tester when you get that far. Either way please please get ahold of me when you to the point you know it’s gonna be a thing because I don’t wanna miss out on the current prices and availability of the parts kit. I can’t tell you how many times I saw parts kit jump in price or stocks dry up because of increased interest from our crowd. A recent example is the Malaysian steyr Aug surplus kits practically disappearing Internet wide shortly after psr made a video about the nylaug. I admit this could be the result of other factors but I can’t help but feeling like that video was responsible for three fourths of all nylaug parts kits sold since the videos release.

It’s possible I could’ve over looked the instructions but I never saw any mention of an extractor. It seemed to be entirely dependent on blowback. Id been savin a proper ten inch barrel liner

It didn’t up load so here’s the link https://drive.google.com/file/d/1j_3oFT3btxOaGFL2aUVwgEhizPpV_aSp/view?usp=drivesdk

I just realized before posting the link that I only partially assembled the setup. It was supposed to have a length of seamless metal tubing as part friction reducer part concentricity control in concert with a end plate the piston indexes against.

Despite omitting these two seemingly crucial components the piston indexes on button headed m3s lock nutted at equal height and even works albeit with multiple stoppages. Although it could be from the ill assembled muzzle device (it’s not doing any favors im sure) I believe it more likely to be an incorrectly matched recoil spring given the failures were always with the subs making it cycle just enough to extract the empty shell without enough rear speed to throw the shell free of the slide often getting caught in a double feed situation.

Can you not just buy a barrel? If you live somewhere that’s firearm adverse then isn’t ammo gonna be your real problem? If you can get ram sets without difficulty then you could always make 26.5 mm from 1inch electrical conduit piping. Or 15mm or 37mm which in my opinion is just as fun if not more than regular firearms and aren’t technically firearms in the US.

The mp5k looks Soo nice although I think it needs a shorter magazine to match the smaller dimensions. Is there a bom yet?

The contrast is a good choice.

I always wanted to build one but as I understand it the bolt is based of the EZ 22 bolt. Ive never been able to get any build based off the ez22 bolt to properly chamber a round from any mag I tried. Did you have to do any fine tuning after you got everything assembled?

This should have never happened. There’s several details regarding the inciting incident that this guy should’ve considered as out of the question the main one being modifying a rental firearm. On top of that, I would be terrified of bringing any printed fire control part to a public gun range of all places given all the extra risk of people standing beside you. Then considering he has no way of testing his print before hand and just assuming it’s functional enough to use in a gun he probably knew absolutely nothing about beforehand that kinda irresponsibility is why I shudder Everytime I see or hear something about guncad from mainstream sources. It’s almost always something negative. It wouldn’t surprise me if the initial incident was on social media somewhere. You know damn well his whole plan is was to film it for clout.

If I could find a halo magnum that is compatible with FDMA style instead of PY2A rails then id print one soon as I got home but the only one I could find has a trigger guard within the handguard which isn’t accurate looking to me.

I’ve never seen a true Mac style lower (magazine in the grip and behind the trigger) that didn’t use a traditional Mac trigger assembly. So based on that logic: No. However In addition to the other guy’s suggestions I’ve seen a super safety compatible MacDaddy frame that requires you to cut a small amount of your uppers bottom side just behind the trunnion. It’s a lot easier than it may sound tbh it was harder to order the accompanied trip plate from SCS that must be bent. My dumb ass selected the wrong thickness and ended up with a bar instead of a plate. 😞

The barrel really sells it.

My only gripe is the stock situation. I think it speaks to the size of 3d2a community. Impact 5.7 uppers being out of stock at the same time of unseenkillers 5.7 Mac release may be coincidence but I somehow don’t think I’m it is having seen similar things being suddenly in out of stock shortly after a 3d2a release more than once in my two year span of interest in the hobby segment.

Is there anywhere other than mpa selling the uppers in 5.7?