04-08-2008, 12:11 AM
Good job Steve , one day when I get caught up on other peoples projects I want to put my spin on this project, i have been discussing something very similar with another member here for almost two years, seeing it actualy work gets worked up
04-13-2008, 02:58 AM
No Hope For Me
How did you attach that cord or string to the bolt carrier so you could cycle it when you were testing it?
04-13-2008, 03:38 AM
I drilled a hole through that triangular section at the back of the BC (cut it off later) and put an S hook in it. I have about a mile of 'super string' I got on a bobbin about 30 yrs ago; it's rayon/nylon of some sort and I double it and make a grip like a lawnmower starter on the back, so it didn't rip my hands up. I did ALOT of cycling tests. Later, after joining the top section, you may have to press out the lengthwise 'bow' to get it cycling like it did before welding. Happened to me on both. Adequate 'slop' on the piston is important too, so the piston doesn't bind in the tube/ gas block. With a tube rcvr, and additional welding/warpage, it happens. That took some time (!!!) AFTER it was already cycling smoothly, to get it cycling smoothly again
BC's are HARD. Tapping the holes for the BC ext was a nightmare - went through two taps on each one. Had to start them with a tack hammer (ever done that? real good for the tap you know) Annealing would have helped. Used 1/2 x 1/8 flat steel for the BC ext and 10/24 screws to attach it. You can start with 8/32 and bump it up to 10/24 if the threads strip. A couple holes stripped on my first one.
Grind or mill a square corner at the base of the 'hump' on the BC for your BC ext, so it is 'seated squarely' and can't flex
When you get the placement right, you can weld it in place, but go light on the welds because you may have to replace it later - thin flat steel will allow you to bend the "L" slightly to adjust feed-stud position side-to-side for better feed, and lighter weight for cycling. Had to adjust both of mine several times (in the vise with a wrench) even after it was feeding/shooting, but once it's right you should be OK. BC ext is easy/quick to re-create once you have it about right (built 3 for the first, 2 for the 2nd - milling one PERMANENT is beyond me). I drilled the hole in the back for the recoil spring guide a bit oversize so it will 'find center' and BE CENTERED with the RS tube, and no 'side friction' on the spring - don't cut the rcvr to final length until you have it hand-cycling and feeding with the TC - Stock TD pins must clear the recoil spring. That's where all MG47s so far vary. I ALMOST got myself in a severe bind with the rcvr length on #2 THE DAY AFTER writing 'the logic post' duh... that's when I re-made the 'Ferrari-tailed BC ext' to recess BETWEEN the TD pins. Gained 5/8" more stroke
Notice the 10/24 in the rear, 8/32 in the front
Hope that helps
Alot of miracles were involved in my MG47s. Cutting off the bayonet lug was on the list of things-to-do when I encounted M240 HG's the same day for $5 each. Upside down bayo lug served no purpose behind the FS, right? Top HG got notched, and inserts INTO the upside-down bayo lug, rock solid w/ flush fit
I didn't have a plan for HG's, until these showed up. It helps to pray while you're building away. Length was perfect with the custom gas tube. No cutting.
I'd made diagonal cuts (??) on the front bottom of the rcvr which wound up engaging the metal inside the HG's. Looks weren't a major concern but burning my hands was. Sometimes I feel like Forrest Gump because You never know what you're gonna get
Last edited by cntrailrider; 04-13-2008 at 04:52 PM.
04-13-2008, 02:56 PM
04-13-2008, 04:36 PM
I was also planning Uzi springs, but when I first shot it, it was MUCH tighter than now. I didn't think I could pull off a twin-spring system, with a fresh build. Now she's broken in and cycles with my pinky, so I plan to attempt it. My problem lately is no shop time
Uzi springs should work, but Mac springs are even smaller dia for straddling the BC ext, so we'll see what happens. I didn't want to narrow the back of the BC ext too much, for fear of breaking
G3 stocks are ideal for this because of where the hole is already located in the stock, for the recoil spring. Used furniture sets can be obtained from Robert for $8
HK G3 Surplus Green Stock Set
If you're taking pics as you go, please post them!
04-18-2008, 04:13 AM
Interested in some of this furniture, I don't suppoe you could tell me Roberts display name? Thanks a million.
Originally Posted by cntrailrider
04-18-2008, 09:08 AM
I believe he is referring to Robert at Gun Parts - RTG International Surplus Gun Parts and Militaria .
Robert has been good to deal with.
05-17-2008, 02:29 AM
Has anyone else completed an MG47 yet? I know alot of you've received TC's, parts, steel, etc. with intentions of building one but it's been awfully quiet concerning build progress. I've been very short on shop time or there'd be more progress here. That, plus reloading. If anyone has build pics to share, we'd sure like to see them - works-in-progress in any phase of construction
05-18-2008, 05:47 PM
Slow but sure Steve...
Yes, it's been kinda' quiet around eh?? Well...'wheels have been turning here...I finally got my TC, TC pin, FT, links & starter tabs from RTG...'now deciding whether or not to go with square tubing or bent sheetmetal, with the latter being a good possibility. While waiting around for the parts I've designed a captured twin recoil spring setup [.25" roundstock rails that will attach to the BC via threads], with an adjustable feed lever pin [on a bearing] aperature that will make setting up the feed timing easier. FCG will be unmodified semi AK, housed as a drop in unit similar to SHARPSHOOTER's...
I'm also exporing another BF system that hasn't been discussed here [top secret!].
'Will post pics when I have something more than parts to photo!
06-20-2008, 03:20 PM