Vector MP5-40 kit needs a gunsmith

[oinco]

[spyder]

All of the pins are the same size. Is the pin that the red arrow is pointing to supposed to touch the locking thing or just be there so the locking thing cannot spin all the way around? The way it is in the picture, it will not let it spin all the way around, it isn't actually up next to it and touching it though. If that is all it is supposed to do, I will just file the pin down and make it flush.

[oinco]

more pics coming shortly...batteries just died. If you look at your LP...do you see on the side of the eccentric lobe the rounded slot? that slot cradles the longer pin when in position- so in the above pic the LP insertion should be counter clockwise rotation. The roll pin should keep you from rotating it clockwise.
In the "port" at the 11:30 position above- if the LP is installed that "cradle/slot" should be captured with the long pin and be clearly visible- that functions sort of as a tensioning "spring".

In the bolt head itself, my roll pin that captures the roller spring protrudes about 20 thousandths into the bore for the LP- this rides in the slot on the spade of the LP.

[oinco]

[spyder]

I got all of the pins in, it is just the pin on the side that I am going to have to file down that is left.


The next question is about the barrel into the trunon. There is a notch taken out of the barrel (yellow) and I am wondering where it goes, up, down, on one of the sides... and how far do I push the barrel in? Does it go till it is flush with the lip on the trunon (red)? Or do I push it in further? Oh, and how do I tell how the size on my rollers? All I have is a tape measure right now...

[oinco]

The receiver below is really embarassingly dirty- as I have not cleaned it after it was cut/demilled. I am no expert at all with building these but hopefully this helps-please consult with others more adept at this than I! There are some cats on hkpro that could help I'm sure.
I believe the best thing to do is to tack the trunion in place first?
The trick is to get something rigid/appropriately shaped and non-marring into the receiver to press against the trunion face etc. etc. Pressing the barrel into the trunion until "close" before tacking makes sense to me.
I can see merit for pressing the barrel from either direction... I typically like to freeze the pressed piece and have the receiving end at least pretty warm to help with getting a good square start and to minimize the possibility of galling.
I suppose "worst" case is that you have to grind off the weldment/remove the trunion/barrel and buy another trunion and start over if something goes awry like the barrel is pressed in too far or ??

standard rollers are typically not marked on the smooth end, +2/+4 or -2 etc. rollers are usually marked, sometimes with just dashes vs numerals. I believe the standard rollers should measure 8.0mm diam. You will need feeler gauges to measure your bolt gap.