Rail Alignment and Receiver

Anything MG42 related.
Post Reply
Rwt987265
Friendly New Guy
Friendly New Guy
Posts: 1
Joined: Thu May 30, 2019 12:34 pm
Anti-spam: Mg42

Rail Alignment and Receiver

Post by Rwt987265 »

Hi,

I recently purchased one of the M3 kits with a receiver that was cut in three pieces. I drilled and removed the rails that came with the receiver because portions of them were torch cut. I am attempting to test fitment of a set of used rails and was wondering if anyone could provide a link to bolts that can be used to align the rails and test how smoothly the bolt moves on the rails. Bolts that I have previously tried interfere with the bolt movement. I'm also curious as to how one would expand the receiver due to shrinkage that may occur during the torch cutting process.

Summary
-Please provide a link to bolts (or specific dimensions) or device to test bolt fitment before riveting
- I have been told that during the torch cutting process, the receiver may shrink a bit. How have people remedied this problem?

Thanks
Countryboy77
Stabsgefreiter
Stabsgefreiter
Posts: 29
Joined: Sat Nov 10, 2018 7:32 pm
Anti-spam: Mg42

Re: Rail Alignment and Receiver

Post by Countryboy77 »

Used small 6/32 screw head on the inside,nut outside.Make sure the bolt clears the bolt heads. Now to making up metal from torch cuts.Use a set of salvaged rails with holes present to line up receiver sections so you can see how much material is missing,bolt in recouperator as well.If it's a semi get your denial in and make a cut so FA grip stick doesn't fit. 3ways to make up for missing metal. A doner receiver section for fill in, sheetmetal welded into the spaces , 1/4 copper stock as a backing and filling with weld. Don't try to weld the receiver at the same time.Add metal to each section till they overlap tightly then weld together.This approach will greatly reduce shrinkage.The more metal you try to fill the more it will shrink/warp.Small short passed ,jumping around to give time to cool in between each one.Good luck, love to see guys bringing these back to life ,and if you get it going you have earned your bragging rights.If your mg3 kit is crushed and cut ,there's your doner sheet metal,go get a real receiver to start.Those smashed cut kits are useless unless your a blacksmith with too much time on your hands.
Post Reply