Saturday, October 27, 2012

RPD stuff must be really popular....

Because I got more hits this week since I posted the video of my somewhat-finished RPD than I have ever gotten in any week.
Thanks to SayUncle and TheFirearmBlog for redirecting folks here. If this is your first visit, take a look around at some of the other gun projects I have, or just leave a comment.

Guess I need to get moving on that HiPoint drum and my Bren MK1 soon.....

Monday, October 22, 2012

More on my RPD project, first time to cycle a belt of ammo

I've been remiss in posting about my firearm projects due to working on everyone else's stuff, but I've made some time to work on one of my own toys lately that I tried (in vain) to get ready for the DABII. That would be the RPD, for those of you who read regularly.
I actually had the RPD at DABII, but I just couldn't get the blasted thing to run. There were a few reasons for this, but none of them took much work to correct.

To start off with, I really didn't care one way or the other if this rifle even remotely resembled an RPD by the time I was done, moreover I just wanted something belt fed to play with that fired a cheap cartridge. Since most of the RPD builds I've seen have been somewhat unreliable, and every one of them has used a striker fired design that may or may not work, I figured I would change things up and use a hammer fired design. The striker system for these rifles has just proven to be too finicky, and when you've got a firearm that only runs ammunition that has a 100% chance of having very hard primers (like Wolf ammo), you need a fire control group that can smack the primer hard, every time. Otherwise you wind up with a very heavy club.
I had a lower receiver and FCG from a H&K G3 rifle sitting here, and that seemed like a good donor piece after mocking it up on the RPD receiver.



That looks like it was meant to be there, if you ask me.

I needed to mill out the bottom of the bolt carrier a little more than I already had in order to clear the hammer.





Now, the original recoil spring system consisted of a rat tail spring and push rod that fit inside the butt stock and extended into the receiver of the firearm, pushing the bolt carrier forward under spring tension. This was great, except it would not work with a hammer fired system, since the push rod would be directly in the way of the hammer. As such, I originally tried to work around that by stretching the receiver an inch, and building a push rod extension that was milled out in the center so a hammer could travel through it, but this wound up not working very well. After thinking about it a little while, I figured I would just go with dual recoil rods, one on either side of the hammer.
This would entail machining a small piece of steel to retain the recoil rods, and allow the recoil spring to push against them. This was made from an unknown piece of steel I had laying around.


The end result....

Now, I needed a recoil rod retainer, similar to the buffer tube on an AR15, but longer and smaller in diameter. I found a piece of tubing in the scrap metal pile that the aforementioned recoil rod pusher fit in and reciprocated without binding, then threaded the end of it for a 3/4" plug. This tube was then welded inside the lower receiver section/buttstock section from the RPD at the same angle as the original.
I then welded in some pieces of sheetmetal to connect all the corners and make the end of the rifle come together a bit better
Let's take a look at it and see how it looks assembled....






 I also removed the barrel and cut it down to 14.5", then welded a flash hider/muzzle extension on.
In the above picture, you can see a aluminum handguard that I machined for it. I probably won't cover how I machined it, as I don't think I'll be keeping it. It's too boxy and just doesn't look right on the gun.

After some thought, I figured that while it was a pretty unique looking rifle, I still wanted something else different to it that had not been tried before. I have a soft spot for NFA toys, especially machine guns, and since I couldn't build this into an actual machine gun, I wanted to do the next best thing and build a bump fire stock for it.
For those of you unfamiliar with the concept, google "slide fire stock". You'll see that with one of those stocks on your AK or AR, you can easily emulate full auto fire. Well, what would be cooler than to do a "full auto" 100 round belt dump?
So, I removed the HK pistol grip, and cut it's mount off the HK lower. I then milled a piece of aluminum that bolts to the AR stock, and has a provision to allow a AR15 pistol grip and a aluminum stand off piece of metal that keeps your trigger finger off the trigger until the rifle is pulled forward by your forward hand.

I haven't got any good pictures of the bump fire stock parts, but here's what I do have.

There's a piece of sheetmetal that encases the aluminum and keeps it reciprocating in a straight line, back and forth. It's not the prettiest thing I've ever built, but it works, and after I do some clean up, it should look a bit better.
On the other hand, I'm strongly considering redoing the entire rear half of the rifle anyway. We'll see.

Now, how does it look in action?

The first round got caught between the bolt carrier and the receiver instead of ejecting, but other than that, it ran great. Prior to this video, I had loaded about 25 rounds into a belt, and shot it off using the bump fire stock. It made for a REALLY good burst, but my cameraman didn't have the camera working, unknown to me. =( It makes for a fun range toy, like many of my other home built guns. It didn't run well at DABII, because there were issues with the feed tray that I could not easily detect, but after getting it home and seeing friction marks from steel case ammo rubbing on the tray and continually jamming the works up, I was able to mill out the offending sections and get a reliably feeding rifle out of it. Next up is to build a better looking handguard and maybe redo the buttstock area. If nothing else, I'll load up a couple belts, take it to the range on occasion, and let 'er rip! a

Tuesday, October 16, 2012

Attn: Cormac, Nick The Blogless, and others in the Dallas area......

I am wanting to head to the NRA CON in Houston this spring. We spoke before about carpooling.
Any remaining interest in that?

Politics made simple and hilarious.


If you don't look at another internet ever again after today, make sure these are on the list to watch first.








Likely the most awesome thing I have EVER seen!

Saturday, October 13, 2012

Random update




Life has come at me pretty hard lately. Nothing is wrong, per se, other than me being too busy to blog, read, comment, or really do much of anything other than school-work and work-work. I haven't gotten very far with any new builds, any time I've had in the garage lately has all been building Suomi parts.

At this time there are no more Suomi kits being taken in. I have decided it is not in my best interest to offer my services except to a select few.
I started doing this to give some people an opportunity to build a parts kit on their own, without having to figure out how they could do all the difficult machining and parts sourcing. After doing the machine work on a couple dozen parts kits, it's time to let it go. I simply haven't the time or patience to deal with it any longer. At the end of the day, I've met some great people that I not only got to do some machine work for, I also made a good friend out of them. Those people will always have my hands and tools available when called upon. There were also those who appreciated my work, paid me a fair amount for it, and then our transaction was complete. They went on to build a completed firearm, and likely were (or will be) met with great success and happiness at the conclusion of their hard work in finishing one of my kits. Then there are the remaining others, who are never satisfied.
To those of you who simply tried to steal my hard work from me, or just didn't feel like your day was complete until you whined at me for taking too long or charging "too much", I will not miss losing the opportunity to help you in the future.

Anyway, with that said, I have an idea for some other projects I hope to take on in the future. A belt-fed rifle, built on AK parts, a miniaturized 1918 Browning Automatic Rifle, and a couple of other parts kits sitting in boxes.
I also have some more work to do on a certain Hi Point drum assembly. Yeah, yeah, I know. Talk's cheap, hurry up and finish that one! I know many of you are itching to see that one completed. I'm actually ready to work on it again.

I have an uberpost of sorts stirring around in the back of my mind that the Borepatch has stirred up. I might have it up soon.

More as I get to it........