MG47ES Belt feed - Page 13

lakeracer69 · 09-06-2008, 10:10 AM

What spring did you use for a recoil spring and how long?

Thanks,

John H. in NH

SHARPSSHOOTER5090 · 09-06-2008, 02:48 PM

LK
I used a m60 recoil spring (from Numrich) and started at 16" and trimmed so it still would feed and not be so strong that it would short cycle. Each build is a little different so you will have to experiment a little.

SS

lakeracer69 · 09-06-2008, 07:41 PM

Thanks for the info.

I tried 2 different M60 springs and the old style single wound looks like the one to use. The new style double wound spring is a little wider and won't fit in the gas piston extension without opening it up a little. I might do that as it is a stronger spring.

SHARPSSHOOTER5090 · 09-07-2008, 03:08 AM

With the extra parts I made to do the MG47ES tutorial I am making a MG47BP (bull pup belt feed). AK based with a RPD top cover because it is shorter. With the internal ES style FCG and return spring I can cut about 3" off the rear of the receiver and end up with a really short gun. Still staying with a 16" AK barrel and a 26" overall length so I won't be required to SBR it. I will post pictures tomorrow if I can get to it. Still got a few details to figure out like how to put on a G3 style cocking handle and get the trigger bar from the grip stick that's ahead of the FT to the internal FCG.
Since both my MG47 and MG47ES are big heavy beasts I decided to try CTR's route and build as light and short of belt feed as I can.

SS

SHARPSSHOOTER5090 · 09-08-2008, 08:59 AM

I will post some pictures of what I have done on the MG47BP so far as soon as I can figure out how get them do to 2MB file size??? Help please

SS

**sniper69** · 09-08-2008, 10:08 AM

Quote:

Originally Posted by SHARPSSHOOTER5090

I will post some pictures of what I have done on the MG47BP so far as soon as I can figure out how get them do to 2MB file size??? Help please

SS

sharpsshooter - if you want to email me the pics I'll be more than happy to post them for you.

**sniper69** · 09-08-2008, 01:18 PM

For pics of sharpsshooter's MG47BP go to the new thread he started at MG47BP BELT FEED BULLPUP

lakeracer69 · 09-10-2008, 07:25 PM

Sharpsshooter,

Where did you find a 12mm OD bearing X 5mm ID X 5mm width. I have had no luck locally or online. An MG42 bolt actuating pin measured .465" and the top cover feed "track measured about .485". Closest thing around here is:
11mm X 5mm X 5mm. Any help is appreciated.

SHARPSSHOOTER5090 · 09-10-2008, 10:10 PM

I used a 1/2" OD x 3/16" ID X 3/16" wide and ground down the OD to 12MM and it fit fine over a No. 10-32UNF screw. The thickness I left at 3/16". I believe I saw a 12mm OD x 5mm ID x 5mm thick bearing in McMaster-Carr though. An 11mm OD bearing should work, it doesn't have to fit exactly snug. CTR didn't use a bearing, just a stud that fit in the track.

SS

cntrailrider · 09-10-2008, 11:35 PM

A cap screw (I believe 5/16") works fine and is less complicated. Take your TC to the hardware store and get one that fits the track. Also easier to move it if your timing is off. To re-position, just weld the hole shut, re-drill and re-tap.

Steve in El Paso