Its a very important part of the gun that is probably the most confusing part in your kit.
What does it do ?
It pushes the barrel forward after the gun has been fired. This returns the barrel to its forward position , ready to fire again.
Where does it go ?
It sits in the bottom of the receiver with the long tube part facing towards the barrel on the left side viewed from the rear of the firearm.(cocking handle would be on right side).
How does it attach ?
There are two bolts used to mount the recuperator to the receiver.
The first is a normal looking bolt that has small flats on its underside of its head. This bolt is used in the rear rectangular opening of the recuperator body. It protrudes out the bottom of the receiver behind the gripstick mounting pin and is secured by a 10-32 nut with a diameter of 9MM.
The second bolt is very unusual in appearance , it has a head with a long and short side. this head fits into the opening on the tube of the recuperator to secure the barrel plunger in to the tube against the spring pressure. The threaded part of this " T " bolt protrudes through the left side of receiver just behind the camming piece where its secured by a 10-32 nut with a diameter of 9MM on the outside.
pictures of these bolts are available below
CHECK FOR WELD BUILD UP IN THE CAM AREA BINDING THE PLUNGER BEFORE INSTALLING RECUPERATOR
What are the different types ?
Well , the obvious two are the original " MG42/M53 type " without a tail after the rear section and the latter " MG3 type " with the tail.
The less obvious are small differences in spring strength and shape of barrel plunger head.
Are they compatible ?
YES and NO, There are no real differences between an MG42 recuperator and a M53 Yugo recuperator. The reports to date so far say people are having good results from whatever recuperator they received with their kit ( 8MM or .308) as long as it is assembled right and in decent condition from the start.
On the other hand the tail of the MG3 type has definite clearance issues with a MG42 unmodified receiver, and the MG42 style buffer. (click to go to buffer stickie.) .
Arrow points to tab that needs to be removed to install MG3 recuperator.
Tab is part of the gripstick mount which is riveted just in front of the buffer lock cams . Aproximately .60" gap between the two.
How does that front nut get installed again ?
With the long leg facing towards the butt-stock when the recuperator is in the gun.
shown the correct way on the left side in this picture.
How many pieces should i have ?
- 14 total
1) the main sheetmetal body
2) 1 short rod
3) 2 long rods
4) 1 barrel plunger rod
5) 1 spring (slightly shorter)
6) 3 springs (same size)
7) 3 keeper washers
8 ) long and short attaching bolts with nuts (1 each)
How do i assemble it ?
the following picture shows the parts lay-ed out in order they go into the tube.
Start with the small spring , then the small rod , then a keeper .
BE CAREFUL THE SPRINGS ARE DANGEROUS WHEN COMPRESSED
assembling the part is not easy to do and will require, 3 hands , two sets of safety glasses and several small screwdrivers as well as some cursing.