Post by Broad Arrow on Nov 9, 2009 13:12:45 GMT -5
Years ago I put 700 rounds through a RS Sten MkII at a reenactment event and I’ve always lusted after a airsoft version.
I got a Ver. 2 model recently. Comes with the adjustable hopup and larger diameter tube stock that can fit a stick battery. While everything else on the gun is steel, the actual tube of the tube stock is not steel, the stock plate and buttstock are steel, how they managed to weld, solder it together is a bit of a mystery.
Comes with a 8.4v 1100Mah NiMh stick battery that fits in the stock. The stock can easily take a 9.6v stick. However the fit is tight, I had to rewire the stick battery with a flat connector that ran the length of the battery to the wire. A regular 16 or 18 gauge wire running along side the cells makes the stick too wide.
The adjustable hopup is hilarious. No movement in the hopup arm at all. The geometry was wrong, but instead of trying to fix it, they just stuffed a spring in place of where the nubbin would be and made it a fixed hopup. I modified the hopup arm and now it works as it should with a nubbin. Those wacky clone makers LOL.
Let see, chrono'd 304-307 with .2's Excels out of the box.
I've just added a 229mm DB tight bore barrel and Systema hop bucking, as well as fixing the hopup as I already mentioned.
Gearbox is a modified Ver. 7. The case is sloped in on the top at the nozzle end. It is also designed to use stock ratio gears, not M14 gears and a stock length cylinder, not the longer V.7 cylinder. It would be tough to make a regular Ver. 7 box work, so keep that in mind when doing upgrades that put more stress on the case and increases the possibility of cracking the original gear case.
Gearbox parts as follows:
- stock length cylinder (full) and piston
- Custom cylinder head (looks like a Ver. 3 but longer in length)
- Ver. 3 spring guide and regular Marui ratio gears (NOT the Ver 7 M14 gearset).
- Custom tappet (looks like a Ver 7 but uses a centered nozzle design)
- M14 nozzle. Not really required, but a regular nozzle doesn't fit the tappet right.
I’ve installed:
- 6mm Systema tempered bushings (stock bushings are 6mm nylon and brass for the bevel gear). They need to be glued as the stock bushings are a hair bigger in diameter
- Area 1000 piston
- Area 1000 ball bearing piston head
- PDI 150% spring
- Guarder chrome MP5 ported cylinder (stock cylinder is non ported. Since the inner barrel is so short, I'll give up some fps for efficiency by using a ported cylinder)
The trigger switch is really crude but looks pretty sturdy. I think the weak point will be the lack of a motor spring in the motor housing. Makes motor adjustment really tough and your bevel gear shimming better be spot on since there is no give in the motor position at all. This could be the limiter with how much modding you can do.
I tried a Systema Torque Up gearset (wanted to drop the ROF). It was very unforgiving in the bevel gear and motor pinon mesh as I suspected. Chewed up a Systema bevel gear. I had to go back to the XYT gearset. The stock motor pinion gear is very hard, impressive.
With DB tightbore(stock length), Guarder M14 airseal nozzle, Area 1000 Pistonhead with bearing, Guarder MP5 slotted cylinder and PDI 150 spring, I'm chronoing at 395-398 with .20g Excel bios. Perfect.
I went 405-410 with a ball bearing spring guide so I took it out and used the stock spring guide (less compression on the spring).
ROF with a 9.6v was 12 fps with the Torque Up gearset, I forgot to check the ROF with the XYT gears. Obviously it will be higher.
The stock 50 round metal magazine fits and works flawlessly.
I ordered up a pack of King Arms MP40 110 round midcaps. Other users report that they fit and work fine. Not so for me. The King Arms mags would not seat properly. I had to do major modifications so that the mags could move approx. 1mm forward (towards the nozzle) in the magwell. I also had to lightly dremel the bb restrictor tab in the mag. After all the mods the mags now fit and load well. I have had no double feeding problems as reported elsewhere but that could be because I'm using a Systema hopup bucking and got the hop up working right. Hope all this is useful.
I spent several days reworking the five mags, which is just what the troops had to do to their Stens before Dieppe and then had to return their weapons when the invasion was first delayed. They were then issued new Stens and had to do the modifications all over again. Very realistic. Good show that. LOL.
The AGM is crude, heavy and for me, highly enjoyable.
Arnhem!
I got a Ver. 2 model recently. Comes with the adjustable hopup and larger diameter tube stock that can fit a stick battery. While everything else on the gun is steel, the actual tube of the tube stock is not steel, the stock plate and buttstock are steel, how they managed to weld, solder it together is a bit of a mystery.
Comes with a 8.4v 1100Mah NiMh stick battery that fits in the stock. The stock can easily take a 9.6v stick. However the fit is tight, I had to rewire the stick battery with a flat connector that ran the length of the battery to the wire. A regular 16 or 18 gauge wire running along side the cells makes the stick too wide.
The adjustable hopup is hilarious. No movement in the hopup arm at all. The geometry was wrong, but instead of trying to fix it, they just stuffed a spring in place of where the nubbin would be and made it a fixed hopup. I modified the hopup arm and now it works as it should with a nubbin. Those wacky clone makers LOL.
Let see, chrono'd 304-307 with .2's Excels out of the box.
I've just added a 229mm DB tight bore barrel and Systema hop bucking, as well as fixing the hopup as I already mentioned.
Gearbox is a modified Ver. 7. The case is sloped in on the top at the nozzle end. It is also designed to use stock ratio gears, not M14 gears and a stock length cylinder, not the longer V.7 cylinder. It would be tough to make a regular Ver. 7 box work, so keep that in mind when doing upgrades that put more stress on the case and increases the possibility of cracking the original gear case.
Gearbox parts as follows:
- stock length cylinder (full) and piston
- Custom cylinder head (looks like a Ver. 3 but longer in length)
- Ver. 3 spring guide and regular Marui ratio gears (NOT the Ver 7 M14 gearset).
- Custom tappet (looks like a Ver 7 but uses a centered nozzle design)
- M14 nozzle. Not really required, but a regular nozzle doesn't fit the tappet right.
I’ve installed:
- 6mm Systema tempered bushings (stock bushings are 6mm nylon and brass for the bevel gear). They need to be glued as the stock bushings are a hair bigger in diameter
- Area 1000 piston
- Area 1000 ball bearing piston head
- PDI 150% spring
- Guarder chrome MP5 ported cylinder (stock cylinder is non ported. Since the inner barrel is so short, I'll give up some fps for efficiency by using a ported cylinder)
The trigger switch is really crude but looks pretty sturdy. I think the weak point will be the lack of a motor spring in the motor housing. Makes motor adjustment really tough and your bevel gear shimming better be spot on since there is no give in the motor position at all. This could be the limiter with how much modding you can do.
I tried a Systema Torque Up gearset (wanted to drop the ROF). It was very unforgiving in the bevel gear and motor pinon mesh as I suspected. Chewed up a Systema bevel gear. I had to go back to the XYT gearset. The stock motor pinion gear is very hard, impressive.
With DB tightbore(stock length), Guarder M14 airseal nozzle, Area 1000 Pistonhead with bearing, Guarder MP5 slotted cylinder and PDI 150 spring, I'm chronoing at 395-398 with .20g Excel bios. Perfect.
I went 405-410 with a ball bearing spring guide so I took it out and used the stock spring guide (less compression on the spring).
ROF with a 9.6v was 12 fps with the Torque Up gearset, I forgot to check the ROF with the XYT gears. Obviously it will be higher.
The stock 50 round metal magazine fits and works flawlessly.
I ordered up a pack of King Arms MP40 110 round midcaps. Other users report that they fit and work fine. Not so for me. The King Arms mags would not seat properly. I had to do major modifications so that the mags could move approx. 1mm forward (towards the nozzle) in the magwell. I also had to lightly dremel the bb restrictor tab in the mag. After all the mods the mags now fit and load well. I have had no double feeding problems as reported elsewhere but that could be because I'm using a Systema hopup bucking and got the hop up working right. Hope all this is useful.
I spent several days reworking the five mags, which is just what the troops had to do to their Stens before Dieppe and then had to return their weapons when the invasion was first delayed. They were then issued new Stens and had to do the modifications all over again. Very realistic. Good show that. LOL.
The AGM is crude, heavy and for me, highly enjoyable.
Arnhem!