Do you know who can help me with a manual project on Mac10?

First it's nearly impossible to assemble a gun and not have your hand in the way. Second why don't you post a better assembly video? This the video accomplished its goal, I watched the video and could now assemble one of these guns. If you can't assemble one of these after watching this you shouldn't be assembling any guns until you learn some basics of mechanical engineering.

Yes it is.

Thanks. The actual recoil rod is carved in the middle so the hammer can go through in the middle. The two arms of the fork rod must be welded to the bolt , this is the only way that the rod can resist the forces the gun exerts on the it. I bought a set of those striker setups years ago but realized they don't work for long, usually in the range of 50 rounds. This gun works good with the original stock and recoil rod but is exceptional with the AR10 tube and spring. The original spring is moody because is small diameter, the AR10 spring makes this gun super smooth and reliable. It is a pleasure to shoot. As of today we have already built 3 guns with the 3d printed lower, without a problem. One of next projects will be the metal lower.

Thanks for the insight. I look forward to purchasing your metal lower.@@SC-yw1uc

Sorry for the late reply but it took me a little to get what WZ and a Grau are (they are War Zone game and the Sig 551 rifle in that game). I am sorry but I am like more than 50 less than 60 years old so I guess a little out of sync. Should have asked my associate that would have known for sure. Coming to the question: if you are talking of the SG551 Swat of the game (short barrel) the handguard is a normal handguard with an added (bolted) rail per side. But I guess you refer to the Sig 551 infantry rifle barrel length which has a strange (longer) handguard and that as I know does not exist. The good news is that we can easily draw it nad 3d print in a new pro material which lasts forever and i unbreakable (the same we make our RPD receivers). Just a matter to do it, thanks for pointing it. RIght now we are working on installing our new CNC machine as soon as we finish that we will attack this project. If you want to add details etc. please contact us and we will consider what you will contribute. Thanks. Simon.

This is a SIG 551-2 Swat ex Louisiana police which we rebuilt into a working firearm. It is my personal firearm and the only gun as nimble as the AR70/223 (series I). I love because it was the Counter terrorism gun when I was in the service (I never had it as I never was in that outfit but loved anyway). We added like 1" welded extension before building it so it is a 16.1" rifle now and can have the stock. A customer should bring me another parts kit in the future as he wants that built and sold but consider we are talking of $5000/6000 guns once built. The one imported now are aluminum not steel, have a different lower than US aluminum lower (good thing, these are better), have 16" long barrel and need stock and folding mechanism. In the end they cost as one of these guns, more or less.

​​@@interforusagroupinc.3638thank you for replying, this is really helpful. Your build is really good, I'm honestly jealous. Yes, I figured 3d printing might be the only option. Again, thank you very much for the help, I don't honestly know why you don't get that many views. You guys are awesome!

@@elrze_qwentum4841Thanks for the compliments. We don't have many views because (1) our movies are not professional (in truth we both hate to be filmed but we have to show something) , (2) we don't advertise or hype our work much and (3) maybe this is a niche product in comparison to real mainstream. Maybe we should devote more attention to videogame guns. Thanks. Simon

Absolutely yes. Right now the 3d printed lower works perfectly but still we have a slight flexibility problem which tends to make the gun shoot binary. Right now the gun is super safe, super reliable but binary (shot 50 rounds more today , more tomorrow at the range). The gun right now is a breeze to shoot because in binary it is is fast, smooth and super super reliable. The material we are using now is impossible to break but has a little too much flexibility. The sensation of power and rate in binary is the same I felt on the Italian MG42 when I was in the service, as Italian Mg42s had a heavier bolt which made the gun shoot a tad slower. For some reason the gun has a lot more energy of an AK with the same cartridge. But is binary while we would have liked a selectable safe/semi/super fast (super short pull and release like we have on our ARs). Under this aspect we are machining our first aluminum lower prototype in the next days. It will be definitely reliable but will cost more than the 3d printed. So in a way or the other we should have something to sell pretty soon. And stay away from the striker setup like the plague, it is a mega pain to build and is designed so that a small spring is flattened by the sear. This makes the system last like 500/100 round at most and then starts to go water pistol (pull trigger nothing happens, pull like 2 or 3 times and shoots one). I bought the last 10 years ago before the company closed and I have sold them all, of course informing the buyers that the system did not work or was heavy maintenance at nest (many knew already). This is the reason we started this version.

@@interforusagroupinc.3638 Sounds like exciting news.... personally im just interested in a housing a normal semi auto group is fine with me. If you complete this project let me know id be excited to pick one up even if its a protoype (plastic or not) i have mill can could take a pro-type piece and build my own)

@@dustineliason3816 I have added you to the our RPD mailing list so you will know as soon as we have something. Again this is already working but need some more work. Also we are considering to buy a CNC machine to make the part in aluminum and this would solve all possible problems.

Yes thank you for pointing the mistake.

or you use zamac (zinc alloy) with low melting point (380-400C) and hardnes of soft steel. Make mold from high temperatur silicon 450C max i think you can start an serial production lol

Yes, sure we can. Contact us at [email protected] for details.

12 1/4”

Thank you very much. We are using your system on the PPS-43. So a part of the result is your merit too.

@@interforusagroupinc.3638 Thank you for the kind words! I am honored we can provide support for a gold standard builder like Interfor!

@@freedommachineworks Thank you. We are just people which try to actually make things on a bench and with some affordable tooling. That is all.

It has not , does not need them because it has an adjustable gas system which did not exist at the time. Adjusting the gas to "just right" prevents need of heavier buffer and twin tubes (which were needed to handle the gas in excess) making the gun perfectly reliable. At the time the big problem of this gun was FA fire because it made the gas problem more important. We don't do NFA guns so we had no way to tell but I am ready to bet that the adjustable system would solve that problem too. As of today we have built some of these without a problem. Thanks for watching this video.

me too

Yes we do: WWW.INTERFOR.US . We build all kinds of firearms, from HK family to MGs.all in semiauto version.

Not in the USA. In most part of US States the normal Citizen can build their own guns.

Lol maybe in your 3rd world shit hole

please contact me at [email protected] so we can talk prices. We don't put prices on site because of continuos fluctuation of meterials and parts prices. The hard part is finding a parts kit for this gun these days. If you find one secure it.

@@interforusagroupinc.3638 Just sent a message form on your website

@@scooter4849 Just answered. Check email please.

The problem is that 99% of the indstrial made short barrel HK have this problem. That is because, due to the short barrel, the normal rifle locking pieceis too firm while the pressure in the barrel goes down fast because of short length. The problem can be easily solved but each gun must be inspected and tested by itself at a range where you can disassemble the gun and modify it between tests, so not a public range. The ideal is a practical shooting range where you can rent a bay all for yourself with a table, like we do. It can be locking piece, mainspring length, rollers (bolt gap), even the flash hider has a lot of influx on the outcome and the ideal combination is different for each gun. Just imagine how much doing this on every industrial gun, much better to test fire a couple rounds rearming by hand and offload the problem onto the final customer. This of course does not happen on G3 and G3K (12") barrel length rifles because they have pressure in excess for the job, but on 8.5" and shorter barrel (like the Dragon 4.5") this is more of a problem.

@@interforusagroupinc.3638 Thank you for the information!

Simon fixed mine and it is perfect. Simon is amazing guy and awesome builder. I used his services as a client and ended up being a friend.

I'm having the same problem my friend what exactly did you fix/replace

Your is ready to start. Just waiting for your "GO" (идти in Russian), as agreed. Could be ready in less than a month.