Fitting Mag in Vulcan

[nhcruffler]

Well I am slowly progressing with my AMD65 screw build on a Vulcan. I am having trouble inserting my mags. It looks like they are hitting ,on the right side,
the tab ,below the bottom rail. I cant get them to snap in unless I really beat on em. On my MAK90 the mags all slide past this tab, so I'm thinking I should file/dremmel it down a bit. The bolt also seems to be sticking on the ejector ( evidenced by the shinny spot on ejector ). The ejector looks alot bigger than on my MAK90 and I am thinking of taking it down abit also. Any comments would be apreciated, esp. if Im getting ready to make matters worse.

[longun45]

You will have to trim and heat treat the ejector, open the mag well. When you work on the mag well put in our trigger guard and then using a dremel type tool you will need to open the mag well. Most of the owrk will be done at the rear portion of the mag well but a bit will have to be taken off the sides. You may also have t work a bit on the mag release to get them to lock in. Also check your alignment with the lower rails and the front trunion. They may also need to be adjusted. The holes on the reciever were off by a bit for all of the trunions. Mine were as I found else where at least a 1/16 too far to the rear and also a bitoff on height. I opened them up a bit and things went better.

[nhcruffler]

Thanks Longun45, I worked on the sides of the magwell and that tab on the right lower rail and the mags are going in alot nicer. I dont think I have to take any off the rear of the magwell. With the front trunion clamped in place I can move the mag forward and back about 1/8 ". This is a bit more than on my MAK90 but it does feed and eject OK. Any idea on the recomended play of the mag? It also looks like I have to open up the slots on the rear trunion to get that to fit properly on the top rails. I see that the rivit for the folding stock is going to get in the way. Should I cut into the rivit or the reciever to get a good fit?

[bsn]

Your mag should be tight against the trunnion. Make sure your trigger gaurd is installed and tight then use the mag to locate the front trunnion with no play. You will probably have to do some work on the trunnion holes in the receiver. My biggist gripe about the Vulcan is the pre-drilled holes, they would be better off with none or undersized holes so you fit them correctly. I have done a few amd65's what do you mean by the rivet for the folding stock being in the way? The amd65 will have to have 1 new set of holes drilled for the rivet and the lower set on the Vulcan filled.

[nhcruffler]

What I am referring to is what the folding stock pivots on. It doe,sn't look like a pin but more like a rivet. It sticks up and blocks aprox. the last 1/16" of the slot , on the right side , of the rear trunion that slides into the reciever. I have the trigger guard installed and the only way to make the mag tighter would be to take a little off the front of the reciever. I know I'll have to work on the holes in the reciever to line up with the holes in the trunion. Right now there off just a bit like everyone elses. Thanks for the advice as this is my first build ( I'm using the screw method ) and not as easy as my STG58. All I had to do on the STG58 was read a bunch of the posts and it went right together.

[bsn]

The pin that the stock pivots on is recessed, so yours must be working its way loose. I remove it and remove the stock before fitting the trunnion to the receiver. It makes it easier to match the slot in the side exactly. After the rear trunnion is mounted, use the existing holes in your trunnion as a guide and drill an access hole for the pin and a hole for the stock release pin. Tap the pin back in place and use a center punch to spread out the end of the pin. If you have to take a little off the front of the receiver to get a tight mag fit make sure you take the time to do it. A file will work fine. During firing much of the force on the trunnion is transmitted to the mag and then to the receiver via the triggerguard. If you have a loose fitting mag all the force is put on the 6 trunnion bolts/rivets and eventually they will egg shape the holes in the receiver or shear the rivets/screws.

[nhcruffler]

I guess I overlooked the obvious, the pin came out with a couple of raps. With the stock off, it will definitly make it easyer to fit the rear trunion. I'll file the front of the trunion for a tight mag fit. That will put the holes in the reciever and trunion closer in alignment. I dont think I am going to get anything done tonight as I had a trip to the dentist this afternoon and am full of vicoden right now . As he came at me with that drill all I could think about was how nice it would be to have one of those foot operated heavy duty rigs. Wonder if it takes standard Dremmel bits?

[SOF]

I just got a new Vulcan receiver for my AMD build yesterday. Just a quick check last night and all the trunion holes seem to line up perfectly. All the dimensions seem to be right on. I probably just jinxed myself.....

[nhcruffler]

Is that a 63 or a 65? I wonder if they finally got the hole placement corrected or if you just got a mistake, wich is actually correct.

[bsn]

When it comes to trunnion fit you can have two guns the same model but the holes in the trunnion will be slightly different when properly fitted. The pre drilled Vulcans sometimes fit perfect, but usually are a little sloppy and can cause all kinds of problems. The Vulcan throws off beginning builders because they think just because the trunnion holes line up all is well. The other higher quality and more expensive receivers out there don’t drill the trunnion holes because of this reason.