Heym SR20
Well-Known Member
Following on from previous threads Turning a Combination Gun into a Double Rifle
I picked up combination gun from local gunsmith who had fitted the Einstecklauf I had ordered from Germany.
The trickiest part in the whole proceedings was persuading my FEO that adding a liner barrel (or Einstecklauf to give it its German name) to my 16 Bore barrel of a combination gun does not a semi automatic rifle make. It took a good four months for my variation to arrive before we could place the order in which time £1 went from c€1.20 down effectively parity by the time you had done the money transfers.
I did consider sending my gun across to Germany to have the barrel fitted :- it would work out cheaper to fly out there with it on my EFP and wait whilst they fitted it and then return.
I placed the order in January. Early march a parcel arrived at my friendly RFD. Three major parts required gunsmithing. The Rim and the muzzle sleeve are deliberately oversized and need maching down to a tight push fit
The Muzzle Sleeve fits into the choke and is fixed to the liner barrel about four inches further back. You will see in the muzzle picture above there are four screws - these bear on a taper on the end of the barrel - this allows you to adjust the point of impact to point of aim
At the breach end there is a tapered brass collar that bears on the forcing cone of the shotgun chamber and this along with the rim keeps the barrel firmly in place. Once fitted it is tight, but requires a few light taps with a wooden rod to remove it.
The trickiest part was fitting a little extractor. The manufacturer drawings showed a simple mortice. Gunsmith was not happy doing that so she instead cut a really nice little dovetail and keeps it all in place with a little screw.
So its all fitted and ready to be sighted in.
I know that the bottom barrel shoots well, and I expect the top to shoot as well. The tricky bit will be the adjustment to point of aim - that will require a calm day and lots of patience methinks. Realistically If I get two shots into a clay pigeon sized target at 50 to 100 yds then thats good enough for any running pig. I will likely set up a heavy load - 173 gn H-Mantels - copper tipped partitioned bullets for use on Boar, with my 1.25-4 x20 S&B scope as the driven set up, with my current 139gn Hornady load with 6x42 scope as the stalking set up.
It will be interesting to see if given the little extra weight it the bottom barrel still shoots to the same point of aim - hope it does, but not surprised if it does not.
I will report further.
I picked up combination gun from local gunsmith who had fitted the Einstecklauf I had ordered from Germany.
The trickiest part in the whole proceedings was persuading my FEO that adding a liner barrel (or Einstecklauf to give it its German name) to my 16 Bore barrel of a combination gun does not a semi automatic rifle make. It took a good four months for my variation to arrive before we could place the order in which time £1 went from c€1.20 down effectively parity by the time you had done the money transfers.
I did consider sending my gun across to Germany to have the barrel fitted :- it would work out cheaper to fly out there with it on my EFP and wait whilst they fitted it and then return.
I placed the order in January. Early march a parcel arrived at my friendly RFD. Three major parts required gunsmithing. The Rim and the muzzle sleeve are deliberately oversized and need maching down to a tight push fit
The Muzzle Sleeve fits into the choke and is fixed to the liner barrel about four inches further back. You will see in the muzzle picture above there are four screws - these bear on a taper on the end of the barrel - this allows you to adjust the point of impact to point of aim
At the breach end there is a tapered brass collar that bears on the forcing cone of the shotgun chamber and this along with the rim keeps the barrel firmly in place. Once fitted it is tight, but requires a few light taps with a wooden rod to remove it.
The trickiest part was fitting a little extractor. The manufacturer drawings showed a simple mortice. Gunsmith was not happy doing that so she instead cut a really nice little dovetail and keeps it all in place with a little screw.
So its all fitted and ready to be sighted in.
I know that the bottom barrel shoots well, and I expect the top to shoot as well. The tricky bit will be the adjustment to point of aim - that will require a calm day and lots of patience methinks. Realistically If I get two shots into a clay pigeon sized target at 50 to 100 yds then thats good enough for any running pig. I will likely set up a heavy load - 173 gn H-Mantels - copper tipped partitioned bullets for use on Boar, with my 1.25-4 x20 S&B scope as the driven set up, with my current 139gn Hornady load with 6x42 scope as the stalking set up.
It will be interesting to see if given the little extra weight it the bottom barrel still shoots to the same point of aim - hope it does, but not surprised if it does not.
I will report further.