tired of idiots
I have studied your pics, Could you please post more on the photobucket or here?
The belts hold th rounds well enough? What are some of the problems/areas of concern?
Dammmmmmmmm that is some build!!!!!!!!!!!!!! Ok, how about a few pics of the internals?????
That's nicely done - how is accuracy after you've run a belt through it?
Have you considered using a heavier barrel, like a Bren?
I saw that on the MG42 forum - and I must say that is absolutely AWESOME! My hat's off to you - that is something I'd like to do myself.
Not gonna lie, that is all kinds of awesome.
that sir is a work of art
I want to install a longer barrel in order to keep the pressure in the barrel/gas piston up longer to more reliablly cycle the bolt carrier all the way back. Right now, it moves back just enough to cycle but not always. I have opened up the gas port but the pressure drop off too quickly because of the shortness of a standard AK barrel. The barrel appears longer but thats because there is an extension on the front that is larger than the bore and a point of pressure loss.
You must have read my mind - I was going to suggest a longer barrel, but thought it might be taken as nitpicking
Now that you mention it!!!....
You could do well, I think, with a 24" barrel which is a standard RPK size. Give it a longer piston, like a PSL/Dragunov piston length, and give it a longer gas tube. That would increase velocity a considerable amount, something like around 200-400 FPS, and that would no doubt help.
You could use any 7.62x54r sized barrel, which means any Mosin barrel rebuild option that is out there. Chamber it up and lathe it to the right diameters, "done".
The problem - obviously - is that you have is that the 7.62x39 just doesn't have that much power, and you've reverse-engineered a recoil-operated system into a gas-operated system. That in itself shouldn't be too great a concern, considering the FN Minimi, and the Stoner 63, and the fact that there is a 5.56 version of the MG-42 which was a Spanish design IIRC.
Do you know the muzzle velocity?
I wonder if you can benefit from a muzzle booster, like an AKSU (aka Krinkov) style booster? Would be worth a try, that expansion chamber was designed to boost velocity on the AK-74 based design, so in theory it would help your design as well.
I also wonder if you have the "hammer hump" problem? That seriously robs my .308 bullpup of power to the point that it doesn't always reliably feed. Grind the hump and try it- you never know.
Also, what kind of piston do you have? Home made? Original factory? Reason I ask is that if the piston bleeds enough gas by being narrow enough to make a poor seal, it will let enough gas bleed-off to affect functionality. I had an AK-74 malfunction due to a piston I made being too narrow diameter. Possibly a longer piston head would help, I don't know.
Yes I've put a great deal of thought into this before!!! I really do want to build something similar to yours.
AK-47 BELT FEED
All good points. An RPD works with the low power 7.62x39 so this should work also if I get all the variables right. The gas tube is made from a 12 ga. barrel and the gas piston has only .005 to .010" diameter clearance and is about .875 " long. The stroke is as long as the beltfeed cam allows and the gas releaf hole in the gas tube is right at the end of the stroke. I wish I knew what the internial pressure curve v.s. barrel length is. I am not sure that the standard gas block placment from the breach is optimal or needs to move either forward or aft. I do need to make a tighter seal of the gas tube to the gas block though. I am defentlly loseing some pressure there. The hammer cocking hump is just large enough to assure reliable re-cocking. I have some thought of installing a roller on the hump to reduce friction. I have only tried it with the 124 gr bullets but I am going to try the 154 gr soft point bullets. The heaver bullets should have higher pressure if the powder charge is the same.
I was hoping someone would break down and do such a build.
It looks positively great!!