If you've been eyeing those surplus parts kits lately, you probably already know that picking up a solid pps43 receiver blank is the first real step toward a successful project. These kits are all over the place right now, and they're honestly one of the more affordable ways to get into the world of home gun building. But, as anyone who's ever stared at a pile of torch-cut steel knows, turning those parts back into a functioning firearm isn't just a Saturday afternoon job—it takes a bit of sweat, some decent tools, and the right piece of sheet metal to tie it all together.
The PPS43 is a fascinating piece of history. It was born out of necessity during the Siege of Leningrad, designed to be as simple, cheap, and fast to produce as humanly possible. It's basically just stamped steel and rivets. Because it was designed for mass production in desperate times, it has a rugged, "industrial" charm that makes it a favorite for hobbyists. However, because the original receivers were destroyed to satisfy import laws, you need that pps43 receiver blank to act as the foundation for your new, legal semi-auto build.
What Exactly Are You Buying?
When you go looking for a blank, you're usually going to find a few different "stages" of completeness. Some guys sell what is essentially a flat piece of 16-gauge steel with some laser-etched lines on it. If you have a professional-grade hydraulic press and a custom jig, a flat might be the way to go. But for most of us working out of a garage or a small shop, a pre-bent blank is the sweet spot.
A pre-bent pps43 receiver blank already has that distinctive "U" shape formed. This saves you a massive headache because getting those bends perfectly square is harder than it looks. If your bends are even a tiny bit off, your bolt won't slide smoothly, and you'll spend weeks filing and cursing at a piece of metal that refuses to cooperate. Most modern blanks also come with the cooling holes already cut or at least marked, which is a huge time-saver.
The Legal Side of the Build
We have to talk about the "80 percent" rule, though that terminology is always a bit of a moving target with the ATF. Generally, a pps43 receiver blank is just a hunk of metal until you start drilling holes and welding trunnions. Since you're building this for yourself, you don't need an FFL to buy the blank, but you do need to make sure you're following federal and state laws.
The biggest thing to remember is that you are building a semi-automatic firearm. The original PPS43 was an open-bolt submachine gun. Building an open-bolt gun today is a huge no-no in the eyes of the law because they are too "easily convertible" to full auto. So, your build will involve a closed-bolt conversion. This means your receiver blank will need to be modified with a "denial bar"—a piece of metal welded inside that prevents a full-auto bolt from being inserted. It's a bit of extra work, but it's what keeps your project legal and fun.
Tools You're Going to Need
Don't think you can get away with just a hand drill and a hammer. Well, you could, but it probably won't be a gun you'd actually want to fire. To do a pps43 receiver blank justice, you're going to need a few essentials:
- A Welder: MIG or TIG is the way to go. Since the PPS43 is stamped steel, you'll be doing a lot of plug welds and some structural seams. If you're new to welding, practice on some scrap steel first. You don't want your first messy "bird poop" weld to be on your receiver.
- A Dremel or Die Grinder: You'll be doing a lot of trimming. The original parts kit pieces (like the trunnion and the rear sight block) will need to be cleaned of old receiver bits before they fit into your new blank.
- Files: Good old-fashioned hand files are your best friend for fine-tuning the fit of the bolt and the trigger group.
- Clamps: Lots of them. Keeping everything aligned while you tack-weld is the secret to a gun that actually cycles.
The Alignment Challenge
The most common mistake people make with a pps43 receiver blank is rushing the alignment. Think about it: you have a bolt that needs to travel back and forth perfectly straight to pick up a round, chamber it, fire, and extract. If your receiver is twisted or if the front trunnion is welded in at a slight angle, the bolt will bind.
Before you lay down a permanent weld, slide the bolt into the blank. Does it move freely? Does it drop all the way to the front under its own weight? If it sticks, find out why. Sometimes the sides of the blank are squeezed in too tight, or maybe there's a burr from where you drilled a hole. Take the time to get it sliding like butter before you commit with the welder.
Dealing with the Folding Stock
Most PPS43 kits come with that iconic top-folding stock. It's one of the coolest parts of the gun, but it adds another layer of complexity to your pps43 receiver blank. You'll have to cut the slots for the stock hinge and the locking mechanism.
If you're building this as a pistol (to avoid the SBR tax stamp), you generally have to weld the stock in the folded position or just leave it off entirely. If you want a functional stock, you've got to go through the NFA paperwork. Whichever route you choose, make sure your measurements for those rear cuts are spot on. If they're off, the stock will sit crooked, and it'll drive you crazy every time you look at it.
Finishing the Metal
Once the welding is done and the grinding is finished, you're left with a raw steel firearm. You can't just leave it like that, or it'll rust if you even look at it funny. Since the PPS43 is a "worker's gun," you don't need a fancy high-gloss bluing job.
A lot of guys go with a simple parkerized finish, which gives it that classic matte grey military look. Others prefer a modern ceramic coating like Cerakote for better durability. And honestly? Some people just hit it with a high-quality engine enamel or appliance epoxy. If you prep the metal right (sandblasting is a huge plus here), even a "rattle can" finish can look surprisingly authentic for a Soviet-era design.
Why It's Worth the Effort
Building a gun from a pps43 receiver blank isn't about saving money—by the time you buy the kit, the blank, the semi-auto fire control group, the modified bolt, and the tools, you might have spent more than a retail firearm costs. But that's not the point.
The point is the satisfaction of taking a literal "bucket of parts" and a flat piece of steel and turning them into a functioning machine. It's about understanding the mechanics of how the sear trips, how the blowback system balances the recoil spring weight, and how to troubleshoot timing issues. When you finally take it to the range and it pings steel consistently, that feeling is worth every burnt fingertip and every hour spent filing.
So, if you're on the fence about starting a build, just go for it. Grab a pps43 receiver blank, take your time, and enjoy the process. It's a steep learning curve, but it's one of the most rewarding projects a tinkerer can take on. Just remember: measure four times, weld once, and keep your workspace clean. You'll be surprised at what you can build in your own garage.